Direct answer

If you are moving between Thailand’s islands on your own ticket, plan around three corridors: the Andaman corridor (Krabi–Koh Lanta–Koh Phi Phi–Koh Lipe), the Gulf corridor (Bangkok–Surat Thani–Koh Samui–Koh Phangan–Koh Tao), and the mainland-to-Andaman link (Bangkok plus bus and ferry to Koh Phi Phi). Each has its own ferry pace, price band and weather risk, and the choice between a slow ferry and a speedboat often matters more than the choice between operators.

This guide compares those routes the way an independent traveler actually uses them: door-to-door time, luggage handling, monsoon reliability, solo and couple comfort, and what a ticket realistically costs per person.

How the Andaman ferry network actually works

Most Andaman ferries run out of two anchor piers: Saladan Pier on Koh Lanta and Ton Sai Pier on Koh Phi Phi. Almost every island-hopping itinerary funnels through one of them, so it helps to think of them as bus stations on the water rather than scenic crossings.

From Koh Lanta’s Saladan Pier you can reach:

  • Koh Phi Phi (Ton Sai Pier) — about 30 minutes on a speedboat, around 1 hour on a larger ferry.
  • Krabi / Ao Nang (Nopparat Thara) — roughly 1.5 to 2 hours, with combined minivan-and-boat tickets available.
  • Phuket (Rassada Pier) — about 1.5 to 2 hours by speedboat.
  • Koh Lipe (Pattaya Beach) — around 3 hours direct, with island stops along the way.

From Phi Phi’s Ton Sai Pier you can connect onward to Krabi, Ao Nang, Railay, Rassada Pier in Phuket and back to Koh Lanta. The Koh Lanta–Koh Lipe direction is the one that catches independent travelers off guard: it is a genuine inter-island crossing rather than a hop, and schedules thin out sharply in low season.

What tickets realistically cost on the Andaman

Per-person cost bands for the most common legs, taken from published schedules and aggregator listings:

  • Koh Lanta ↔ Koh Phi Phi: roughly THB 450–900, depending on ferry versus speedboat.
  • Koh Lanta ↔ Ao Nang / Krabi: roughly THB 450–700.
  • Koh Lanta ↔ Phuket (Rassada): roughly THB 750 and up.
  • Koh Lanta ↔ Koh Lipe (direct): higher than a short hop; expect a longer crossing price band that reflects the distance.

Speedboats are nearly always more expensive than slow ferries, but they also cut crossing time on the longer legs. Couples and groups rarely save much by booking speedboats: the saving is minutes, the extra cost is per seat.

Koh Lanta to Koh Lipe: the leg everyone underestimates

Koh Lipe sits far down the Andaman coast, close to the Malaysian border, and is not on the way to anything. That is why the route from Koh Lanta to Koh Lipe feels longer than the map suggests.

Realistic ways to do it:

  1. Direct ferry or speedboat. Operators such as Bundhaya and Satun Pakbara list departures in the late morning, typically around 09:00 to 10:30, with advertised crossing times around 3 to 4 hours including island stops. Prices vary by operator, season and vessel type; budget a higher per-person band than for a simple two-island hop.
  2. Via Pak Bara pier on the mainland. Some travelers break the journey by going from Koh Lanta back to the mainland, overnighting near Hat Yai or Trang, then catching a morning Pak Bara–Koh Lipe service. It is cheaper in low season but adds a hotel change.

For most independent travelers, the direct boat is the better default unless monsoon conditions or a tight budget make the mainland detour worthwhile. Book the earliest departure you can reasonably catch, because boats that leave later tend to be the ones that get held up further down the chain.

A few practical notes that do not always show up in schedule pages:

  • Piers change. Many boats do not dock at a single Koh Lipe pier; passengers are often transferred to shore by longtail from the larger moored boat. Pack what you need for the day in a small bag if you want to skip hauling your main backpack across the shallows.
  • Day of week matters. Schedules differ between high season (November–April) and the May–October monsoon window, and within each season some services run only on certain weekdays.

Gulf coast: Bangkok to Koh Samui, Phangan and Tao

The Gulf side of Thailand works through Surat Thani and Chumphon as the two main bus-and-boat hubs. You buy a single combined ticket, board a sleeper VIP bus overnight, then transfer to a ferry at dawn. Door-to-door from central Bangkok to Koh Samui is roughly 11 to 14 hours depending on the overnight bus pattern and pier; to Koh Phangan you add an inter-island ferry; to Koh Tao, another leg on top of that.

What to actually compare:

  • Bus type. VIP 24-seat sleepers are quieter and give you a flat-ish bed; standard 40-seat buses are cheaper and fine if you can sleep upright.
  • Train alternative. Trains from Bangkok to Surat Thani or Chumphon, then a boat onward, give you more legroom than a bus and a chance to stretch at stations, at the cost of a slower arrival window.
  • Day boat versus night boat. Night ferry departures from the Gulf piers are common but tend to be rougher for light sleepers. Day crossings from Chumphon to Koh Tao are the easier introduction to the Gulf for first-time visitors.

For couples and small groups, the sleeper-bus-plus-ferry combo is genuinely the easiest door-to-door option. Solo travelers sometimes prefer the train, partly because arrival times line up better with morning ferry schedules.

Krabi to Koh Lanta: the short hop that gets planned badly

Krabi to Koh Lanta is short and cheap, but it has one wrinkle: most boats actually leave from Ao Nang (Nopparat Thara Beach) rather than from Krabi town itself. If you booked accommodation in Krabi town expecting to walk to a pier, plan for a 30–45 minute transfer by songthaew or minivan to Ao Nang first.

The crossing itself is roughly 1.5 to 2 hours, with per-person fares around THB 450 and up for standard speedboat services. Ao Nang Princess and Bundhaya are the two operator names you will see most often on this route.

Independent travelers regularly make the mistake of trying to connect a Krabi arrival on a long-distance bus the same afternoon straight through to Koh Lanta. It can work, but only with a wide buffer. If your bus is late, you will be stuck overnight in Ao Nang, which is not a bad place to be stuck but is not what you planned.

Monsoon-season reliability: what changes from May to October

The Andaman coast and the Gulf coast have different weather windows, and it is worth treating them that way instead of lumping them together as “low season.”

  • Andaman (Krabi, Koh Lanta, Koh Phi Phi, Koh Lipe). The May–October window brings southwest monsoon swell. Speedboat services are the first to be cancelled on rough mornings. Ferries are more stable in poor weather but do still get delayed. Koh Lipe’s inter-island connections in particular thin out between June and October, and some direct Koh Lanta–Koh Lipe services simply disappear from the schedule. Departures that remain tend to shift earlier to catch calmer water.
  • Gulf (Koh Samui, Koh Phangan, Koh Tao). The Gulf is rougher in the November–February window when the northeast monsoon hits. If your itinerary puts you in Koh Tao in December or January, expect some late starts and occasional speedboat stand-downs.

A practical rule: in monsoon months, always have a buffer night before any onward flight, and treat published speedboat schedules as a wish list rather than a guarantee. Slow ferries lose less time and tend to be the default for travelers who cannot afford to miss a connection.

Luggage, comfort and traveling with a partner or a small group

Ferries in Thailand vary a lot in onboard comfort, and the differences show up fast on the longer routes.

  • Seating. Standard ferries usually have airline-style seating with limited recline; some operators run an open-air deck area that is more pleasant in good weather and miserable when the boat is shipping spray.
  • Speedboats. Faster and more expensive, but you sit on padded benches in a rigid-hull boat with a full tank of fuel under the floor. The ride is bumpy in any swell, and seated passengers get wet if the boat is nose-on to the waves. Couples often prefer speedboats for the shorter crossings where the journey is 30–45 minutes; groups of four to six sometimes pool a private speedboat charter instead, which is a very different budget calculation.
  • Combined tickets. When you buy a bus-plus-boat ticket, your main luggage usually goes in the bus hold and you carry a daypack onto the ferry. Keep valuables, chargers and a change of clothes in the daypack, especially for overnight Gulf crossings where the bus-to-ferry transfer happens at a dim pier in the small hours.

For solo travelers the honest summary is that the Thai ferry network is well set up to be used alone. Stops are staffed, piers have signage in English and Thai, and seat reservations are not the norm on most routes. Couples benefit most from picking the slower ferry over the speedboat on the longer Gulf crossings, simply because two people sleeping upright in airline-style seats is much more comfortable than two people bracing on a speedboat bench.

Frequently asked questions

How long does Bangkok to Koh Samui really take by bus and ferry? Plan on 11 to 14 hours door to door, depending on the overnight bus pattern and which ferry pier you transfer at. Trains to Surat Thani plus a day ferry can take longer in hours but are easier for light sleepers.

What is the cheapest way to get from Krabi to Koh Lanta? A standard speedboat or ferry from Ao Nang (Nopparat Thara) to Saladan Pier is the cheapest direct option, with fares in the THB 450 and up band per person. The cheapest of all is often a minivan-plus-ferry combination rather than a boat-only ticket.

Are ferries between Koh Lanta and Koh Lipe running year-round? Direct services thin out in the May–October southwest monsoon window. Schedules are more reliable between November and April, and some operators only run on certain days in shoulder season. Always check the current operator timetable close to departure and build in a backup night.

Is it safe to take a speedboat in Thailand’s monsoon months? Operators do not run speedboats in conditions they consider unsafe, and ferries are more stable in rough weather. That said, sea conditions can change quickly, so follow crew instructions and keep your daypack accessible in case transfers shift at short notice.

A short planning checklist

  • Anchor your itinerary around one of the three corridors (Andaman, Gulf, mainland-plus-Andaman) and book islands in a logical order so you are not doubling back.
  • Decide on slow ferry versus speedboat by weather, time and budget rather than by default.
  • In the May–October Andaman monsoon, keep a buffer night before any flight and prefer larger ferries.
  • In the November–February Gulf monsoon, expect early-morning delays on speedboat services to Koh Tao.
  • For overnight bus-and-boat combinations, keep chargers, water and a change of clothes in a daypack separate from your main luggage.

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