Thai Islands Guide: Which Island to Pick by Coast & Season

Which Thai islands should you pick?

Competitor guides put the national total at roughly 1,400 islands, and they disagree on the exact count. Most visitors see four or five. Our advice is to ignore the count and choose a coast, a time budget and a travel style. Phuket is the easiest Andaman gateway, so we anchor the routes below on it. For a ranked shortlist, see our ranked island shortlist. This page is the decision guide that comes before it.

Andaman vs Gulf: the two-coast season rule

Thailand's two coasts run on different weather calendars. Andaman Sea islands and Gulf islands do not share the same rainy and peak months. We are not quoting month ranges from memory. Confirm them on the Thai Meteorological Department and Tourism Authority of Thailand pages before you book anything. Booking the wrong coast for your month is the costliest error on this page. When one coast is in its wet spell, look at the other.

Andaman Sea islands from Phuket

Phuket is the largest Thai island and the main Andaman transport hub, according to one competitor guide. Koh Phi Phi is reached by ferry from Phuket, and one blog puts the crossing at 1.5 to 2 hours. Confirm that with the operator. Koh Lanta is usually reached through Krabi, the other major Andaman gateway. Phi Phi suits snorkeling and nightlife. Lanta is slower, with calm beaches such as Klong Dao and dive access to Koh Haa and Koh Rok. Our Andaman island breakdown goes deeper on each. Park-protected islands set their own fees, reef rules and closures. Read the current notices from the Department of National Parks before you go.

Far south: Koh Lipe, Trang and Satun

One competitor guide says the water is generally clearer and the crowds thinner off Satun and Trang than around Phuket. Treat that as unverified. Koh Lipe is the best-known name here and sits in the far-south Andaman group. Expect longer transfers than from Phuket. Check the current boat operator timetable for your dates, because we found no sourced schedule.

Gulf of Thailand islands: Samui, Phangan and Tao

Koh Samui has its own airport, which makes it the easiest Gulf island to reach. One Bangkok-based guide lists a flight of about 1 hour. Koh Phangan is a 20 to 30 minute speedboat hop from Samui in the same guide. Phangan mixes Haad Rin party nights with quiet yoga bays in the north and west. Koh Tao is the diving name in this group. For Gulf crossings, check Lomprayah's current timetable if it serves your route. Our Gulf island guide compares them in more detail.

Eastern islands: Koh Chang, Koh Mak and Koh Kut

Trat province holds an archipelago of roughly 52 islands, per Travelfish. Koh Chang covers 213 km² and is listed as Thailand's third largest island. Ko Kut covers 105 km² and ranks sixth. Ko Mak is far smaller at 16 km² and works as a farming-island base for families. Most of Chang's forested interior sits inside Mu Ko Chang Marine Park. Lonely Beach is the backpacker strip. From Bangkok, one guide gives 5 to 6 hours by road to the Trat pier plus a 30-minute ferry. Verify that before you commit.

Islands near Bangkok for short trips

Koh Samet is the usual weekend pick. One guide gives 3.5 to 4 hours door to door, via Ban Phe, then a 30-minute ferry or 15-minute speedboat. Hat Sai Kaew is the lively east-coast beach, while Ao Prao on the west side is quieter. Koh Larn is the other short-trip option mentioned in competitor lists. Neither suits divers or trekkers. Both suit anyone who wants sand within a few hours of the city.

Best island by traveler type

Our picks below are editorial judgement drawn from competitor descriptions, not rankings. Several islands fit more than one column. The table shows where we would start looking.

Getting there: time and access trade-offs

Transfer time shapes an island trip more than beach quality does. Samui is the only island here with a one-hour flight in the competitor figures. Everything else needs a ferry, a van, or both. Bangkok-origin times below are unverified competitor figures. Phuket-origin routes need current operator confirmation.

Costs and what drives them

We found no official price list, so the tiers below are relative. One island blog estimates Bangkok to Koh Samet at ฿500 to ฿700 by bus and boat. The same blog puts Bangkok to Koh Chang at ฿400 to ฿1,200. Treat both as unverified estimates. Boat transfers, island-only resorts and peak-season surcharges drive most of the gap between tiers. National park fees add a separate line, so check the DNP page for current rates.

Common mistakes when choosing Thai islands

Most regrets come from planning, not from the island itself. Avoid these five.

• Picking the wrong coast for your travel month.
• Underestimating transfer time on islands without an airport.
• Booking a tight ferry connection right after a flight.
• Expecting nightlife and services on a quiet island like Ko Mak.
• Cramming too many islands into one short trip.
• Assuming a road runs around every island; check the layout before you rent a scooter.

How many islands to fit into a trip

Time budget decides this. With 3 to 4 days, stay on one island. With 7 to 10 days, stay on one coast and hop between two or three islands. With two weeks, take one full zone plus one add-on. Travelfish suggests one zone per trip, and we agree. Our island hopping routes lay out sample sequences. Start from Phuket if you are on the Andaman side.