Best Islands in Thailand
Tropical island escapes from bustling party islands to untouched paradise
Thailand has hundreds of islands split between the Andaman Sea and the Gulf of Thailand, and each has its own distinct personality. The Andaman side delivers dramatic scenery — Koh Phi Phi's towering cliffs, the Similan Islands' gin-clear diving waters, and Koh Lipe's Maldives-like turquoise lagoons. The Gulf islands tend toward a more laid-back vibe: Koh Samui combines infrastructure with tropical beauty, Koh Phangan oscillates between Full Moon Party energy and yoga-retreat serenity, and Koh Tao is one of the cheapest places on earth to learn to dive.
What surprises many first-timers is the range. Koh Chang on the eastern seaboard is mountainous and jungled, feeling more like a national park with beaches. Koh Kood, just south, is one of Southeast Asia's most pristine islands — crystal water, minimal development, and the kind of quiet that's increasingly rare. Even heavily touristed areas have hidden gems: Koh Yao Noi in Phang Nga Bay is a 30-minute boat ride from Phuket yet feels like a different world.
Island closures matter for planning. National park islands (Similan, Surin, Koh Tachai) typically close mid-May through mid-October. Ferries to smaller islands may reduce service in monsoon season. Always check schedules before building your itinerary.
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Top Rated Islands
Browse by region
Kla Island
A pristine uninhabited island near Koh Lipe, prized for its clear waters and untouched natural beauty.
Snorkelling Point
A top snorkelling spot off Koh Lipe with clear waters and vibrant marine life just beneath the surface.
Mu Ko Similan National Park
World-class diving and white sand, but day-trip boats can crowd the beaches, so go by liveaboard if you can.
Browse by Destination
Bangkok
Bangkok
The vibrant capital city with temples, street food, and nightlife
Chiang Mai
Chiang Mai
Northern Thailand's cultural capital surrounded by mountains
Phuket
Phuket
Thailand's largest island with world-class beaches and resorts
Koh Samui
Surat Thani
Tropical island paradise with palm-fringed beaches
Krabi
Krabi
Dramatic limestone cliffs, emerald waters, and secluded beaches
Pai
Mae Hong Son
Laid-back mountain town beloved by backpackers and nature lovers
Kanchanaburi
Kanchanaburi
Historic WWII sites, waterfalls, and jungle adventures
Hua Hin
Prachuap Khiri Khan
Royal resort town with beaches, golf, and fresh seafood
Chiang Rai
Chiang Rai
Home to the White Temple, Golden Triangle, and hill tribe villages
Ayutthaya
Ayutthaya
Ancient capital with magnificent temple ruins and Buddhist history
Pattaya
Chonburi
Vibrant coastal city with beaches, water parks, and buzzing nightlife
Koh Chang
Trat
Thailand's second-largest island — jungle interior, laid-back beaches, and the Koh Mak & Koh Kood archipelago
Khao Lak
Phang Nga
Quiet resort coast north of Phuket — gateway to the Similan Islands and Khao Sok's jungle lake
Koh Lipe
Satun
Thailand's southernmost island — powder-white beaches and the country's clearest snorkelling water
Koh Samet
Rayong
Bangkok's closest island escape — powdery white sand, calm water, and famous beach fire shows
Sukhothai
Sukhothai
Thailand's first capital — UNESCO temple ruins, lotus ponds, and bicycle-pace history
Khon Kaen
Khon Kaen
Isan's university city — silk villages, lakeside temples, and Thailand's best som tam
Udon Thani
Udon Thani
Gateway to upper Isan — the Red Lotus Sea, Ban Chiang's Bronze Age site, and Mekong sunsets at Nong Khai
Koh Phangan
Surat Thani
Full Moon Party island with a quiet soul — jungle coves, yoga shalas, and Bottle Beach
Koh Tao
Surat Thani
Thailand's dive-school island — cheap certifications, resident turtles, and Nang Yuan's sandbar
Koh Lanta
Krabi
Long, laid-back Andaman island — west-coast sunsets, Old Town stilt houses, and easy family beaches
Phi Phi Islands
Krabi
The Andaman's postcard archipelago — Maya Bay, longtail coves, and viewpoint sunsets
Korat
Nakhon Ratchasima
Isan's biggest city — gateway to Phimai's Khmer ruins, night markets, and Korat cat country
Buriram
Buriram
Football-mad Isan province crowned by Phanom Rung — a Khmer sanctuary on an extinct volcano
Ubon Ratchathani
Ubon Ratchathani
Thailand's sunrise city on the Mun River — Candle Festival artistry and Mekong border country
Tips for Islands in Thailand
Book Ferries on 12Go.Asia
The 12Go platform lets you compare ferry operators, times, and prices between islands. Book a day or two ahead in high season. Avoid the cheapest operators if reviews mention safety concerns.
Check Island Closures
Similan Islands, Surin Islands, and Koh Tachai close mid-May to mid-October. Some smaller islands reduce ferry service in monsoon season. Always verify schedules before planning your route.
Snorkel Gear Is Cheap to Buy
Rental gear is often scratched and ill-fitting. Buy a decent mask and snorkel at a Big C for 300–500 THB — cheaper than two days of rentals and much more hygienic.
Bring Cash to Smaller Islands
ATMs on smaller islands like Koh Kood, Koh Mak, and Koh Yao charge high fees and sometimes run out of cash. Withdraw enough on the mainland before heading over.
Frequently Asked Questions
Which Thai island is best for first-time visitors?
Koh Samui offers the best balance of beautiful beaches, good infrastructure, direct flights from Bangkok, and a range of accommodation from budget to luxury. Phuket is technically an island too, with even more options, though it feels less 'island-like' due to its size and bridge connection.
How do I get between Thai islands?
Ferries and speedboats connect most popular islands. Major routes (Surat Thani to Koh Samui, Krabi to Koh Lanta) run multiple times daily. Smaller islands may have only one or two boats per day. Combined bus-and-ferry tickets from Bangkok are available through 12Go.asia.
What's the best island for diving?
Koh Tao is the most popular — it's one of the cheapest places in the world to get PADI-certified, with excellent visibility and coral. The Similan Islands offer Thailand's best advanced diving (liveaboard trips). Koh Lipe and Koh Phi Phi are great for combining diving with beach time.
Are Thai islands suitable for families?
Many are excellent for families. Koh Samui has the best infrastructure (hospitals, international restaurants, kids' activities). Koh Lanta is quieter with calm beaches. Koh Chang has a national park and waterfalls. Avoid party-focused islands like Koh Phangan during Full Moon Party weeks if travelling with young children.