The Similan Islands are Thailand\’s best diving destination — nine granite islands in the Andaman Sea with crystal-clear water, dramatic underwater rock formations, and some of the most diverse marine life in Southeast Asia. Manta rays, whale sharks, reef sharks, turtles, and vast coral gardens make this a bucket-list dive site. This guide covers how to get there, the liveaboard vs. day trip decision, and everything you need to know before going.
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ℹ️ The Similan Islands National Park is open October 15 to May 15 only. The islands are completely closed to all visitors June–mid October. Plan your visit within this window.
How to Get to the Similan Islands
There are no inhabited islands in the Similans — all visitors arrive by boat. The main departure point is Tab Lamu Pier in Khao Lak, approximately 70 km north of Phuket. You cannot simply turn up and take a ferry — access requires booking either a day trip or a liveaboard.
Getting to Khao Lak (the Jumping-Off Point)
- From Phuket Airport: Shared minivan or private transfer to Khao Lak, ~1 hour, ~$10–20 USD. Most day trip and liveaboard operators include or arrange airport pickup.
- From Phuket town: Bus from Phuket Bus Terminal to Khao Lak, ~1.5 hours, ~$3 USD.
- From Bangkok: Fly to Phuket (~1.5 hours, AirAsia/Nok Air from ~$30 USD), then transfer to Khao Lak.
Day Trip vs Liveaboard: Which Should You Choose?
| Day Trip | Liveaboard | |
|---|---|---|
| Duration | 1 day (~12 hours) | 2–4 nights |
| Cost from | ~$80–120 USD | ~$280–500 USD |
| Dives | 2–3 dives | 12–20 dives |
| Islands visited | 2–3 islands | All 9 islands + Koh Bon, Koh Tachai, Richelieu Rock |
| Best for | Snorkelers, budget travelers, first-timers | Divers, anyone wanting full experience |
Day Trips
Day trips depart from Tab Lamu Pier or Thap Lamu at around 08:00–08:30 and return by 18:00–19:00. They typically include 2–3 snorkeling or diving stops, lunch, and national park entrance fees. The boat journey alone takes ~1.5 hours each way — you have around 6–7 hours at the islands.
Day trips are suitable for snorkelers and casual visitors. For divers, the boat journey time makes day trips less efficient — you spend roughly as much time on the boat as at the dive sites.
Liveaboards
A liveaboard is the recommended way to experience the Similans properly. The season runs October 15 to May 15, with most boats operating November to April. A 3-night / 4-day trip covers all nine Similan Islands plus the premium northern sites: Koh Bon (manta rays), Koh Tachai (schooling fish, mantas), and Richelieu Rock (Thailand\’s most famous dive site, whale shark encounters).
Budget liveaboards start from around $280–320 USD for a 2-night trip and up to $500+ USD for 4-night trips on better boats. Book at least 4–6 weeks ahead — popular dates in December–February sell out months in advance.
Best Time to Visit
- November–December: Park just opened, water is calm, visibility builds. Good value, less crowded.
- January–February: Peak season — best visibility, best weather, but busiest boats and highest prices.
- March–April: Whale shark season peaks. Warmer water, good visibility, slightly less crowded than peak. Some liveaboards end in April.
- May (closing weeks): Seas can get choppy as monsoon approaches — check conditions before booking.
What to See
- Donald Duck Bay (Island 4): The Similans\’ most photographed spot — a distinctive rock formation above water, excellent snorkeling below.
- Richelieu Rock (Surin Islands, nearby): Thailand\’s best dive site. Famous for whale shark sightings, also manta rays, seahorses, ghost pipefish.
- Koh Bon: Manta ray cleaning station — one of the most reliable manta sightings in Thailand (January–April).
- Koh Tachai: Schooling fish in massive numbers, occasional mantas, dramatic topography.
- Christmas Point (Island 7): Spectacular soft corals and large pelagics — a classic Similan dive site.
National Park Fees
Foreign visitors pay a national park entrance fee to enter the Similan Islands Marine National Park. As of 2025, the fee is approximately 500 THB (~$14 USD) per person per day. This is usually included in liveaboard and day trip packages — confirm with your operator before booking.
Where to Stay in Khao Lak (Base for Similans)
Khao Lak is a long beach resort town strung along Route 4 — quieter and more relaxed than Phuket, with a good selection of hotels at every budget. It\’s the standard base for Similan Islands trips, with most liveaboard operators based here.
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