Galapagos Island Hopping: How It Actually Works
Four in five visitors now travel land-based, which makes the small fibreglass ferries between the islands the real backbone of a Galapagos trip. They are cheap, they are not comfortable, and the network has a shape you need to plan around.
Short answer
Santa Cruz is the hub. Ferries run Santa Cruz to Isabela and Santa Cruz to San Cristóbal for about $30 to $35 one way, taking 2 to 2.5 hours in small open-sea boats. There is no direct Isabela to San Cristóbal route, so that journey means transferring through Puerto Ayora and usually losing a day.
The lancha to the next island is a fibreglass speedboat with two or three outboards, about twenty seats under a low roof, and a bow where your bag goes under a tarp with everyone else's. On my land-based trip in 2021 I learned the sequence the way everyone does: turn up at the pier early, hand your bag over, take a water taxi out to the boat because it cannot come alongside, then sit down and hold on for two hours of open ocean. It costs around thirty dollars. It is the single least glamorous part of a Galapagos trip and it is also the thing the entire land-based model runs on.
Four out of five visitors are now doing exactly this, so it is worth understanding the network before you build an itinerary that fights it.
How Does The Galapagos Ferry Network Actually Work?
As a hub and spoke, with Santa Cruz in the middle. Public lanchas connect Puerto Ayora to Puerto Villamil on Isabela and to Puerto Baquerizo Moreno on San Cristóbal, each about $30 to $35 one way and 2 to 2.5 hours. Routes generally run once in the morning and once in the early afternoon.
These are not ferries in the European sense. They are small passenger speedboats, open to the swell, with fixed seats and no deck to walk around. Crossing time depends on sea state more than on distance, and in the cool garúa season the ride is bumpier because the wind is up.
Boarding takes longer than you expect. Boats moor off the pier, so a water taxi shuttles you out for a small fee, usually a dollar, and luggage goes on ahead. Budget half an hour of standing around at each end on top of the crossing itself, plus the time it takes to get from the pier to your hotel.
The 290,404 people who visited in 2025 were 79% land-based, which means this network carries an enormous share of Galapagos tourism on boats that seat twenty. Capacity is finite on popular days. Buy the ticket a day ahead through your hotel or an agency on the waterfront rather than turning up at the pier hoping.
| Route | One way | Crossing time | Frequency |
|---|---|---|---|
| Santa Cruz to Isabela | About $30 to $35 | 2 to 2.5 hours | Morning and early afternoon |
| Santa Cruz to San Cristóbal | About $30 to $35 | 2 to 2.5 hours | Morning and early afternoon |
| Isabela to San Cristóbal | No direct service | Not available | Transfer via Santa Cruz |
| Water taxi, pier to boat | About $1 | A few minutes | On demand at each pier |
The practical detail that catches people out is that the ferry system effectively starts on the mainland, not at the pier. Only two airlines fly to the islands, Avianca and LATAM, connecting Quito and Guayaquil to Baltra and San Cristóbal, and your checked bag is limited to 23 kg with a carry-on of 8 to 10 kg. Every piece of luggage, carry-ons included, passes a mandatory SICGAL biosecurity inspection at Quito or Guayaquil before you can check in. Whatever you plan to island-hop with has to clear that inspection first, so packing decisions made at home ripple all the way to the bow of a lancha.
Two pieces of paperwork travel with you rather than with your luggage. The Transit Control Card, US$20, is pre-registered and paid online through the official system before you fly, and the US$200 park entrance fee for foreign adults is paid to the park rangers at Baltra or San Cristóbal airport on arrival, with children under 12 paying US$100. Keep both with your passport. One point that has tripped up travellers working from older guides: the adult fee was raised from US$100 to US$200 on 1 August 2024, so any budget built on the old figure is out by a hundred dollars a head.
Which Island-Hopping Routes Do Not Exist?
The one people always want: Isabela directly to San Cristóbal. There is no such service. Getting between the two outer inhabited islands means a crossing into Puerto Ayora, a wait, and a second crossing out, which in practice consumes an entire day and sometimes an overnight in Santa Cruz.
This single gap should shape your whole itinerary. An efficient trip treats Santa Cruz as the pivot and never tries to cut the corner. Go out to one outer island, come back, go out to the other, come back, and fly home from whichever airport suits.
There is also an airport gap. Isabela has no commercial airport connection to the mainland, so every visit to Puerto Villamil begins and ends with a boat. San Cristóbal and Baltra both have flights to Quito and Guayaquil, which gives you flexibility on the outbound leg if you plan it early. Fares to the islands commonly run $250 to $600 round trip.
If a full relocation to Isabela does not fit your dates, there is a middle path. The long Isabela day trip with Tintoreras, the wetlands and flamingos builds both crossings into a single ten-hour day out of Santa Cruz, so you see the island without changing hotel or paying for two ferry tickets separately, and you can Check availability on the operator's listing. It is a long day and an early alarm. It is also the most efficient way to add a third island to a short trip. Everything departing from Puerto Villamil itself is on the Isabela day tours page.
The gap also works in your favour if you use it deliberately. Because Baltra and San Cristóbal both receive mainland flights, you can fly into one airport and out of the other, which deletes a ferry leg from each end of the trip. Flights from Guayaquil take roughly two hours, around three from Quito including the stop, and open-jaw tickets priced early are one of the few genuinely free efficiency gains in Galapagos planning. Check the fare conditions before assuming the flexibility costs nothing, but the routing itself is routine.
The other consequence of the missing Isabela airport is that everything on Isabela, including the people, arrives by sea. Puerto Villamil's hotels, restaurants and tour offices all exist downstream of a two-hour crossing, which is part of why the town feels quieter than Puerto Ayora and why its locally booked tours cost less: volume is lower and the boat leg is already inside every visit. Treat any Isabela plan as boat-shaped from the first draft, with the return crossing written in before anything else, and the itinerary stops fighting the geography.
Morning Or Afternoon Crossing, And What About Luggage?
Take the morning boat where you can. The sea generally builds through the day, so the early departure tends to be the calmer ride, and arriving before lunch leaves you an afternoon rather than a wasted evening. Luggage is stowed on the bow under a tarp, so anything you care about goes in a waterproof bag on your lap.
Seasickness is a genuine consideration on this route, not a joke. Two hours in a small boat crossing open water between islands affects a fair number of people, and there is nowhere to go. If you are prone to it, take something before boarding rather than after, sit as far from the stern as you can, keep your eyes on the horizon, and pick a morning departure.
The luggage rule is simple and people learn it the hard way. Spray comes over the bow. Bags stacked there get wet even under the tarp, so pack electronics, documents, cameras and anything that must stay dry in a drybag or a sealed liner that stays with you in the cabin. Soft bags stack better than hard cases and are less likely to be left behind.
Watch what you carry between islands, too. Fresh fruit, seeds, plants and many animal products are restricted or banned across the archipelago, and the biosecurity agency publishes the current product list. Buying a bag of fruit for the boat is a bad idea in principle here.
A few park rules matter at the piers and on the water, and knowing them in advance saves awkward moments. Any visit to a protected area within the national park has to be with a naturalist guide authorised by the park directorate, so the guided format of day tours is not an upsell, it is the legal structure. The two-metre distance from wildlife applies even when a sea lion pup comes to you, which it probably will. Drones are not permitted anywhere in the national park or the marine reserve, so leave yours at home rather than surrendering it at the airport.
Sea temperature also changes what you wear on the boat and in the water. The warm season, December to May, averages 74 to 76°F (23 to 24°C), so a thin layer is enough and a swim is pleasant. The cool garúa season, June to November, drops the average to 66 to 72°F (19 to 22°C), and that is when wetsuits go from optional to welcome. The better day-tour operators carry both long and short wetsuits for exactly this reason: one listing we track includes them, along with snorkel gear and lunch, in the base price.
| Item | Where it should be | Why |
|---|---|---|
| Passport, cash, Transit Control Card | On you, in a dry pouch | Bow luggage gets wet and out of reach |
| Camera and electronics | Drybag on your lap | Spray over the bow is normal, not exceptional |
| Seasickness tablets | Taken before boarding | Too late once the boat is moving |
| Main luggage | Handed over at the pier, stowed on the bow | Soft bags stack better than hard cases |
| Fresh fruit, seeds, plants | Left behind | Restricted or banned under the biosecurity list |
How Should You Sequence The Islands?
Put Santa Cruz first and last, since it is the hub and the arrival airport at Baltra feeds into it. Give each outer island at least two nights, because a one-night stay is swallowed by the two crossings. Fly home from the island you finish on, and never plan a ferry on the morning of your flight.
The most common mistake is treating a crossing as a transfer rather than a day. It is a day. By the time you have checked out, taken a water taxi, crossed, landed, found your hotel and eaten, the useful part of the afternoon is what remains. Two islands over five nights works. Three islands over five nights does not.
The other trap is booking a ferry the morning of your flight. Crossings get cancelled for weather, especially in the cool season, and a missed international connection is a bad way to end the trip. Sleep on the island you fly from.
| Trip length | Sensible sequence | What you get |
|---|---|---|
| 4 nights | Santa Cruz only | Highlands, tortoises, bay tour, one boat day, no ferry time lost |
| 5 to 6 nights | Santa Cruz, then one outer island, back to Santa Cruz | Two islands, one crossing each way, a full day still lost to travel |
| 7 to 8 nights | Santa Cruz, Isabela, Santa Cruz, San Cristóbal, fly out | All three port towns, two return crossings |
| 10 nights or more | Same sequence with slack days built in | Room for a cancelled crossing and a full dive or hike day |
How many days you actually need is its own question, worked through in the how many days guide, and if you are still choosing between the islands themselves, the which island to stay on guide compares them on landscape and character rather than logistics.
Packages change the sequencing question rather than answering it. A pre-arranged island-hopping itinerary still rides the same ferries on the same timetable; it simply has the seats bought for you and the hotel nights placed on the correct side of each crossing. What you give up is the option to linger. If a volcano summit is shrouded in cloud on your one Isabela morning, a self-planned trip can swap days around it and a packaged one usually cannot.
Whichever way you plan, protect the last night. The structure that works is a final night on the island you fly out from, a buffer before the flight, and nothing paid or non-refundable booked on a crossing afternoon beyond a walk and a meal. Tour offices in all three port towns will tell you the same thing, because they deal with the fallout when boats run late.
One more sequencing lever worth knowing: the 79 to 21 split between land-based visitors and cruise passengers means ferry seats and good hotels are contended by far more people than the cruise side ever worries about. Book the crossings and your first two nights before you fly, especially around holiday weeks, and leave the day tours for the waterfront offices where you can compare weather and price in person.
Is Island Hopping Cheaper Than A Cruise?
Substantially, yes. Mid-range land-based island hopping runs about $250 to $350 per person per day once you count hotels, food, day tours and ferries. Cruises run roughly $450 to $1,000 or more per person per day, which works out at $3,000 to $10,000 and up for a week.
What the extra money buys on a cruise is reach. Cruise itineraries visit outer islands like Española, Genovesa and Fernandina that no day boat from a port town can get to, and you wake up at a new site instead of spending a morning crossing to it. That is a real advantage and the honest reason cruises still exist alongside a cheaper alternative.
What island hopping buys is flexibility and money staying on the islands. You choose each day as it comes, you can cancel a boat day if the weather turns, and you eat where residents eat. It also lets you scale the cost, since day tours from Isabela start around $75 while San Cristóbal boats run up to $320.
Packaged versions sit between the two. A six-day all-inclusive island-hopping itinerary listed at $1,983 bundles the ferries, hotels and day tours into one booking, which lands at roughly $330 a day, right at the top of the mid-range band. You pay a premium for someone else doing the sequencing.
| Land-based island hopping | Packaged island hopping | Cruise | |
|---|---|---|---|
| Cost per person per day | About $250 to $350 | About $330 on a listed 6-day package | About $450 to $1,000+ |
| Cost per week | Roughly $1,750 to $2,450 | $1,983 for six days | $3,000 to $10,000+ |
| Islands reachable | Three port towns plus day-boat sites | Same, pre-sequenced | Outer islands day boats cannot reach |
| Flexibility | High, decide day by day | Low, fixed itinerary | None once aboard |
| Share of 2025 visitors | 79% land-based | Counted within land-based | 21% |
Both models still carry the same fixed entry costs. Every foreign adult pays the US$200 park entrance fee in cash on arrival under the official park rules, children under 12 pay US$100, and the US$20 Transit Control Card is bought online before you fly. The full side-by-side is in the cruise versus land-based comparison.
The wildlife argument for a cruise is narrower than it first looks, but it is real. The waved albatross breeds on Española from April through December and is absent in the early months of the year, and no day boat from any port town reaches Española. If albatross are the reason you are going, it is a cruise or nothing. The same logic covers Genovesa and Fernandina. Everything a land-based trip can reach, the three port towns and their day-boat radius, is still a long list: tortoises, iguanas, sea lions, boobies, penguins, reef sharks, and the tunnels and craters in between.
Compare packages on what they fold in, not just the headline price. The packaged itineraries we track work out between roughly $235 and $305 per person per day, but the leaner ones leave airport transfers, some meals or entry fees to you, while the fuller ones carry hotels, breakfast, speedboat crossings, guided tours and snorkel gear inside one figure. The park fee and the transit card sit outside every package, because the fee is collected at the airport on arrival, so add $220 for each adult before comparing any two headlines.
The budget end of land-based travel is real too, though it buys a different trip. Hotels in Puerto Ayora start around $30 to $65 a night and Isabela's day tours start at $77, so a self-planned week can undercut the mid-range band if you accept simple rooms and fewer boat days. What you cannot cut is the fixed layer of flights, fees, crossings and at least a couple of navigable days, because without the boat days you are walking the same few streets in one town.
Should You Book A Package Or Arrange Every Piece Yourself?
Arranging it yourself is cheaper per day and more flexible, but a package buys something self-planning cannot: the dependency chain solved before you arrive. If your trip runs under a week, or you are travelling when ferry seats are tight, the premium is usually worth paying.
The reason packages exist at all is the chain. Your ferry times dictate which tours you can take, your tours dictate where you sleep, and your hotel nights dictate which crossings you can catch. Get one link wrong and a whole day evaporates. Operators selling island-hopping packages have done this sequencing hundreds of times, and beyond the hotels, what you are paying for is the confidence that the Isabela ferry ticket exists, that the tour on the far side starts after the boat docks, and that nobody has booked you two nights on islands with no boat between them.
The longest itinerary we track shows what a full package actually covers. The Galapagos: 7-Day, 6-Night Island-Hopping Tour by Latina Real Tours Ecuador starts from $1650, is rated 4.9 from 25 reviews, departs from Puerto Baquerizo Moreno on San Cristóbal, and carries free cancellation on the listing. It includes overnight stays in double rooms with breakfast, all transfers, the boat trips between islands on public speedboats, every tour with an English-speaking national park guide, and snorkel equipment on the tours. Spread over seven days that is under $240 a head before flights and fees, sitting below the mid-range band for self-planned travel.
Before you book any package, run four checks. Ask whether the inter-island speedboat seats are reserved or merely planned, because a package that leaves you buying ferry tickets has kept the one risk you were paying to remove. Ask which meals are included, since breakfast-only and breakfast-plus-lunch itineraries produce very different daily food bills. Ask about single supplements, because double-room pricing assumes you travel as a pair. And check the cancellation window, which several but not all listings carry.
At the shorter end, the Galapagos Intensive 5-Day Land-Based Tour (3 Islands) by Galapagos Natural Life compresses all three inhabited islands into five days from $1353 per person, rated 4.2 from 11 reviews, departing Santa Cruz with free cancellation. It includes accommodation in tourist-class hotels, breakfast and lunch, snorkel equipment, transfers, and a bilingual guide authorised by the national park. The word intensive is doing honest work in the title: five days across three islands means short stays and very little idle time.
Five-day itineraries split into two philosophies, and it pays to know which one you are buying. The intensive version moves you every day or two and shows you all three port towns, at the cost of living out of your bag. The alternative anchors you to fewer stops with a day tour radiating out from each, which is slower and trades breadth for depth but leaves at least one island unseen. Neither is wrong. They are different trips wearing similar prices.
The budget end of packaged island hopping looks different again. The 5-day Galapagos Island Hopping Adventure Expedition by Takiri Travel starts from $1520 per person, is rated 4.5 from 13 reviews, and departs from Baltra Airport. It carries four nights in a double or triple room, breakfast on four mornings, all guided activities with bilingual naturalist guides from the national park, private transportation, the Isabela pier usage fee, entry to a giant tortoise private farm and a tortoise breeding centre, and snorkel equipment. The trade is in the card name: there is no pickup, so the trip starts where you make your own way to it.
Every package, whatever it costs, leaves the same three charges outside its price: the US$200 park fee, the US$20 transit card and your flights. Add $250 to $600 for return airfare before comparing any two headlines, and remember that the per-day figure is the only one that makes a five-day and a seven-day itinerary genuinely comparable.
How Do You Add Isabela Without Losing Two Days To Ferries?
Three ways, all out of Santa Cruz: a ten-hour organised day tour, a leaner eight-hour full day, or a two-day overnight that trades one hotel night for a volcano hike. The day tours fit a tight schedule; the overnight suits anyone who wants Isabela's slower pace and its cheaper locally priced tours.
The day-tour route is the one described earlier: both crossings, the Tintoreras islet, the wetlands and the flamingo lagoons folded into a single ten-hour day. It starts from $285 per person, carries a 4.7 rating from 138 reviews, and includes snorkel equipment, wetsuits in long or short styles as you prefer, lunch, the fuel surcharge and the Puerto Ayora pier fee, so the headline price is close to the real one.
The cheaper full day strips the frills rather than the island. The Full Day Isabela Island Tour From Santa Cruz starts from $184 and covers eight hours with a professional guide, hotel pickup inside the urban perimeter of Puerto Ayora, lunch, and both ferry crossings. It has no rating on the listing yet, so there is no review signal to lean on: judge it on the inclusions and the hundred-dollar saving, and read the itinerary on the live listing before committing. For a budget-conscious traveller, the gap between $184 and $285 is another whole day tour elsewhere.
The overnight option is the one experienced island hoppers tend to end up preferring. The From Santa Cruz: 2-Day Isabela Island Trip with Volcano Hike by Coral Blanco Tour Operator starts from $520 for two days, is rated 5 from 3 reviews, a perfect score on a small sample, and offers free cancellation. It includes roundtrip ferry transfers, one night of accommodation, breakfast, lunches, a guide and transportation on the island, and you can Check availability on the listing. The volcano hike is the centrepiece, and no day trip from Santa Cruz can fit it in.
The arithmetic rewards the overnight more than it first appears. At $520 for two days against $184 to $285 for one, you are paying for a second day, but that second day is priced at Isabela's rates rather than Santa Cruz's: Sierra Negra starts at $77 and Los Tuneles at $187 when booked in Puerto Villamil. Add the fact that you wake on the island instead of racing back to a ferry, and the two-day version stops looking like a splurge. It looks like the correct way to see the largest island in the archipelago.
What If You Only Have Three Days?
Three days is enough for one port town plus one navigable day trip, and not enough for a second island under your own steam. Pick your island to match your interests, stay put, and spend your money on the single best boat day you can find.
The maths is unforgiving. Two nights somewhere means one full day, and if either night sits on the wrong side of a ferry crossing you lose half of it. Anyone who tries to squeeze Isabela into a three-day trip from Santa Cruz spends more hours on speedboats than on land. Choose San Cristóbal or Santa Cruz, commit, and save the second island for a longer return.
There is one packaged exception, and it is priced unusually. The 3-Day Galapagos Trip for Traveler Without Much Time by GAGV is priced per group, from $5600 for the whole group rather than per person, departs from José Joaquín de Olmedo International Airport / San Cristóbal, and carries free cancellation on the listing. It includes the hotel, breakfast and lunch, a navigable tour with snorkeling, transfers, and a tour leader who doubles as photographer. Because the price covers the group, the per-head cost depends entirely on how many of you there are; for a large family it can work out competitively, for a solo traveller it will not.
The self-planned three-day version looks like this: the US$200 park fee and US$20 transit card at the airport, return flights commonly between $250 and $600, a bed from around $30 to $65 a night at the budget end of Puerto Ayora, and one strong navigable day. From San Cristóbal the signature trip is Kicker Rock, from around $160. From Santa Cruz the equivalent is a bay tour or one of the cheaper boat days. That is a complete trip rather than a compromise one, provided you accept its shape in advance.
What a three-day trip cannot absorb is bad luck with weather. A cancelled afternoon activity is a nuisance on a ten-day trip and a real loss on this one, so build your single navigable day into the middle day, never the arrival or departure day. If the sea kills it, you still have the town, the beaches and the interpretation centre, all free.
What Do The Day Tours Themselves Cost From Each Port?
Roughly $145 to $245 per person from Santa Cruz, $75 to $187 from Isabela, and $149 to $320 from San Cristóbal. The island you sleep on is the biggest single lever on your daily spend, which is why sleeping on Isabela for a night or two changes the whole budget.
Santa Cruz boats reach the flagship central sites, and they are priced accordingly. North Seymour, the seabird island, starts from around $230, and Bartolomé, with its famous viewpoint, from around $245. These are the trips people fly home talking about, and they are also the most expensive line items in a land-based budget.
Isabela is the value island. Its local tours run from $75 to $187 per person: the Sierra Negra volcano hike from $77, and Los Tuneles, the lava-arc snorkel site, from $187. The same money that buys one Bartolomé day from Santa Cruz buys both of Isabela's best days with change left over.
San Cristóbal sits in between. Kicker Rock starts from around $160 and the full-island 360° tour from around $190, with the top of the local range reaching $320. Because these leave from the town you sleep in, there is no ferry leg inside the price or the day, which is the quiet advantage of a San Cristóbal-based trip.
| Island you sleep on | Typical day tour range | Signature trips |
|---|---|---|
| Santa Cruz | $145 to $245 per person | North Seymour from $230, Bartolomé from $245 |
| Isabela | $75 to $187 per person | Sierra Negra from $77, Los Tuneles from $187 |
| San Cristóbal | $149 to $320 per person | Kicker Rock from $160, the 360° tour from $190 |
Read day-tour prices the way you would read an airline fare. Some include lunch, snorkel gear, wetsuits, fuel surcharges and pier fees, and others include only the boat and the guide, which can move the real cost by fifty dollars a head or more. The Isabela day trip with Tintoreras sits at the fuller end: snorkel equipment, wetsuits, lunch, the fuel surcharge and the Puerto Ayora pier fee are all in the base price. Before booking anything, check the includes list on the live listing, and browse the Santa Cruz day tours, Isabela tours and San Cristóbal tours pages for the current ranges.
When Should You Go, And What Will You See?
For calmer seas and warmer water, December through May. For the richest wildlife spectacle, June through November, accepting a bumpier crossing. On a land-based trip the season matters more than it does on a cruise, because you personally ride the swell between islands.
The warm season, December to May, brings average sea temperatures of 74 to 76°F (23 to 24°C) and the flatter crossings that make the ferry network feel like transport rather than an ordeal. It is also when giant tortoises breed, primarily January to May, with nesting following and eggs hatching after roughly 130 days, so highlands visits land at their most active. If your priority is comfortable travelling and tortoise activity, this is your window.
The cool garúa season, June to November, drops average sea temperatures to 66 to 72°F (19 to 22°C) and the wind picks up, which is why crossings are bumpier and wetsuits go from optional to standard. What you get in exchange is the densest wildlife calendar of the year: blue-footed boobies court and mate between June and August, sea lion pupping peaks in August and September, and whale sharks peak at Darwin and Wolf between June and November, though those far-northern sites sit beyond any day boat and effectively belong to the cruise world.
Galapagos penguins are the exception to every calendar. They breed year-round with no clearly defined season, though nesting activity is possible from May to December, so a lucky snorkeller can hit nesting at almost any time of year. The honest advice is to pick your season for the sea state and the water temperature first, then treat the wildlife as the bonus it mostly is, because there is no month here with nothing happening.
Whatever month you choose, the tortoise story has a genuinely current chapter. An estimated 20,000 to 25,000 giant tortoises now live across the islands, and the restoration programs keep adding to that number: 158 juvenile Floreana-lineage tortoises were released on Floreana in February 2026, the first return of the lineage after more than 180 years of absence. Day tours and package itineraries that visit breeding centres and private farms put you in front of that work, and seeing it in person is one of the more moving things a land-based trip offers.
Common Questions
Do I need to book the inter-island ferry in advance?
A day ahead is usually enough, arranged through your hotel or an agency on the waterfront. Seats are finite on small boats and popular departures do sell out in the high season, so turning up at the pier without a ticket is a gamble you do not need to take.
How rough is the crossing really?
Rough enough that seasickness tablets are a standard part of the packing list. Two hours of open water in a small speedboat is not a smooth ride, particularly in the cool season when the wind is stronger. Morning departures are generally calmer than afternoon ones.
Can I fly between the islands instead?
Small inter-island flights do operate on some routes and cost far more than the boat while saving most of the crossing time. They also carry tight baggage limits. Most land-based visitors use the lanchas, which is why the fares and timetables above describe the boats.
Is one night on an outer island enough?
No. Two crossings of 2 to 2.5 hours either side of a single night leaves you almost no touring time, and you pay two ferry fares for it. Give any outer island two nights minimum, or take a long day trip from Santa Cruz instead and keep your hotel.
What happens if my ferry is cancelled?
You wait for the next departure, which may be the following morning. This is exactly why you should never schedule a crossing on the day of your flight home. Build a night of slack on the island you are flying from and the risk disappears.