- ✓Hop within one coast, not across the country: the Andaman and Gulf islands are on opposite sides of the peninsula, so mixing them mid-trip is a full relocation day, not a hop.
- ✓Sequence by ferry logic, not by which island looks best — chain islands that are actually connected by direct boats, in a line, so each move is short and you never backtrack.
- ✓Let the season choose the coast: the Andaman islands are best Nov–Apr, the Gulf islands often Jan–Sep, but variable — island-hopping in the wrong season means cancelled boats, not just rain.
- ✓Treat the boat days as the fragile part: put island moves and day trips early in the leg, keep a buffer day, and re-verify ferry status and sea conditions before you commit.
- ✓Slow down — three islands in ten days beats five. Each move eats a half-day in piers and transfers, so the more you hop, the less beach you actually get.
The one rule of island-hopping Thailand: stay on one coast
The single biggest mistake people make planning a Thai island trip is treating the country's islands as one menu. They are not. Thailand has two island groups on opposite sides of a long peninsula: the Andaman islands in the west — Phuket, Phi Phi, Lanta, the Krabi islands — and the Gulf islands in the east — Samui, Phangan, Tao. They are not connected by a quick ferry. Getting from one group to the other is a full travel day across the country by boat and road or a flight, which is a relocation, not a hop. Plan a trip that bounces between them and you'll spend half of it in transit.
So the first decision is which coast, and it's mostly made by your dates. The two coasts are often wettest in different parts of the year: the Andaman islands are at their best in the cool, dry months from roughly November to April, while the Gulf islands are often more settled from around January to September, though conditions vary, with their heaviest rain later in the year. In island-hopping this matters more than for a single beach stay, because the boats between islands are weather-dependent — the wrong season doesn't just mean rain, it means ferries cancelled by rough seas and a leg of your trip stranded. Settle the coast and the season first; then the islands chain themselves.
This page is about sequencing — the order you visit islands, how to chain them by ferry, and how to pace the hops. It deliberately leaves the relocation mechanics to the dedicated route pages and the ferries hub: which operator runs which crossing, the fares, the last boat of the day. Here we answer the planning question those pages can't — given a coast and a length, which islands, in what order, at what pace.
The Andaman route — Phuket, Phi Phi, Lanta and the Krabi islands
The Andaman coast is the postcard Thailand — sheer limestone karsts, longtail boats and turquoise water — and it island-hops beautifully in the cool, dry season. The cleanest sequence runs as a line so you never double back. Start at Phuket, the gateway with the airport and the fullest range of hotels; use it as a base for a Phi Phi or Phang Nga boat day before you commit to staying anywhere smaller. Move to Koh Phi Phi next — dramatic, lively and busy, the natural second stop and a direct ferry from Phuket. Then drop down to the slower, longer Koh Lanta to wind down, again on a direct boat. That's a classic Andaman line: Phuket → Phi Phi → Lanta, each move a single short crossing.
Krabi adds a parallel branch on the mainland side: Ao Nang as a base, the boat-only beaches of Railay a short longtail away, and day trips out to the Hong Islands and the Krabi islands. Many travellers fold Krabi and Phuket into one Andaman loop, since they're connected by ferry and road. The key discipline is to keep the chain in a line and on direct boats — don't plan a hop that requires backtracking to Phuket between every island, which is where itineraries quietly bleed days.
For the relocation detail on each leg — which ferry company, the crossing time, the fare and the last boat — use the route pages; they own the logistics. This route just sets the order and reminds you to put the longer crossings and the day-trip boats early in the leg, so a rough-sea day still leaves a buffer to reschedule.
Koh Phi Phi travel guideThe dramatic, lively second stop on the Andaman line — where to stay, what to do, and the boat in.
Phuket to Koh Phi PhiThe relocation logistics for the first Andaman hop — ferry operators, crossing time and fares.
Krabi island hoppingThe Krabi-side day trips — Railay, the Hong Islands and the four-island tour — to slot into the Andaman leg.
The Gulf route — Samui, Phangan and Tao with a different rainfall pattern
On the other side of the peninsula, the Gulf trio hops just as neatly and with a different rainfall pattern — often more settled from around January to September, though conditions vary, which makes it the smart choice for a mid-year island trip when the Andaman is into its green season. The three islands sit close together and are linked by frequent direct boats, so the sequence almost writes itself.
The natural line is Koh Samui → Koh Phangan → Koh Tao, working from the largest and most developed to the smallest. Samui is the easiest arrival (its own airport) and the most resort-polished base; Phangan, a short ferry away, balances the Full Moon Party with quiet northern beaches and wellness retreats; Tao, a little further out, is a major Thai budget dive-training hub, where many visitors learn to scuba. Run it in that order and each move is a single short boat. Divers often weight the trip toward Tao; party travellers time Phangan around the full moon; relaxers linger on Samui — the sequence flexes, but the line stays the same.
As on the Andaman, the relocation mechanics — the Samui–Phangan and Samui–Tao ferries, the timetables and the last boats — live on the route pages and the ferries hub. This route's job is to keep you chaining the three in a line on direct boats, putting any day trips (like the Ang Thong marine park from Samui) early, and holding a buffer for the days the sea is too rough to sail.
Koh Samui travel guideThe Gulf gateway and easiest arrival — the resort-polished base that opens the Gulf line.
Koh Samui to Koh TaoThe relocation logistics for the Gulf dive-island hop — ferry operators, crossing time and fares.
Koh Tao travel guideThe smallest Gulf island and major budget dive-training hub — the natural end of the Gulf line.
When crossing coasts is worth it — and when it isn't
There's one legitimate reason to do both coasts in a single trip: time. If you have two weeks or more, crossing the peninsula once — from an Andaman island to a Gulf one, or the reverse — can be worth it to sample both island characters, and it can make seasonal sense in a shoulder month when one coast is fading and the other is coming good. But it is a one-time relocation, budgeted as a full travel day (a ferry to the mainland, a road or rail leg across, and a boat out to the next island, or a flight), and it should sit cleanly between the two coast legs — never as a mid-trip zig-zag.
On a shorter trip, crossing coasts almost never pays. A ten-day island trip that tries to do Phi Phi and Koh Tao spends two of those days getting between them, for the sake of saying you did both. Far better to pick the in-season coast and go deeper: three islands done slowly on one coast will always beat five done in a rush across two. If you find yourself plotting a both-coasts hop on a short trip, that's the signal to cut one coast, not to add a travel day. The both-coasts move belongs on the two-week and three-week routes, where the days exist to absorb it.
Pacing, day trips and the booking order
Island-hopping rewards restraint more than almost any other Thailand trip, because every move is amphibious: a transfer to the pier, the wait, the crossing, a transfer at the far end, and the half-day of momentum lost to all of it. Plan two or three islands per ten days, not five, and give yourself at least two nights on each — one-night island stays are nearly all transit. Mix the rhythm: a base island for several nights with day trips out (a Phi Phi day from Phuket, an Ang Thong day from Samui) is often more relaxing than relocating every couple of days, and it keeps your bags in one place.
Get the booking order right and the fragile parts are protected. Book the peak-season island hotels and any cross-coast move first; book day-trip boats once you arrive and can read the sea. Place the longest crossings and the boat days early in each leg, so a rough-sea cancellation leaves a buffer day rather than blowing up the whole chain. Above all, treat the sea as the volatile thing the entire plan hinges on: ferry status, sea conditions, timetables, fares and hotel offers all move with the season and the weather, so verify the current details against the official operator or the ferries hub before you commit money — and again close to each boat day. The sequence is yours to set; the sea sets the timetable.
Sources and official planning resources
Island hopping · at a glanceIsland FC
- Best season
- Andaman islands best Nov–Apr; Gulf islands often steadier Jan–Sep; check the forecast — hop the coast that's in season, never both at once
- Ferry/flight access
- Andaman hubs Phuket & Krabi; Gulf reached via Surat Thani or Samui airport — verify operators, timetables and last-ferry times
- Route shape
- A line within one coast (Phuket–Phi Phi–Lanta, or Samui–Phangan–Tao) — connected by direct boats, no backtracking
- Time needed
- 10–14 days for a relaxed coast loop; 3 islands beats 5 — each move costs a half-day in transfers
- Best for
- Beach travellers who want multiple islands without mixing distant coasts or chasing boats
- Sea/weather risk
- Boat days are the fragile part — rough seas cancel ferries in the green/wet season; keep a buffer day
- Book / verify first
- Ferry timetables, the cross-coast move if any, and peak-season island hotels — re-check ferry status before each leg
