After seven years in Phuket, I've done the Similan Islands trip more times than I can count — and I still consider it one of the most jaw-dropping underwater experiences in Southeast Asia. Crystal-clear water with 30-metre visibility, granite boulders the size of houses, and reef sharks cruising past like they own the place. Which, in fairness, they do.
But there's a lot to know before you book. The Similans are only open half the year. Not all tours are equal. And the "Phuket day trip" sold by some Patong touts involves a punishingly long transfer that eats into your time. Here's the honest guide from someone who's made every mistake already.
When Are the Similan Islands Open?
This is the single most important thing to understand. The Similan Islands National Park opens and closes on a seasonal schedule set by the Department of National Parks (DNP):
| Period | Status | Conditions |
|---|---|---|
| Mid-October to mid-May | ✅ Open | Calm seas, 20–30m+ visibility |
| November – February | 🌟 Peak season | Best visibility, calm Andaman |
| March – April | ✅ Good | Still excellent, fewer crowds |
| Mid-May to mid-October | ❌ Closed | Monsoon season, rough seas |
The exact open/close dates shift by a week or two each year depending on sea conditions. Check the Mu Ko Similan National Park official website or confirm with your tour operator before booking in early November or mid-May.
Getting There: Day Trip vs Liveaboard
You have two main options, and they deliver very different experiences.
Day Trip from Khao Lak (Recommended)
Khao Lak, about 90 minutes north of Phuket by road, is the closest departure point. Tours leave from Tab Lamu Pier at 7:30–8:00am and return by 5:30–6:00pm. You'll spend about 4 hours at the islands with 3–4 snorkel or dive sites.
Most Phuket-based travellers drive or take a minibus transfer to Khao Lak, join the tour there, and return the same day. It's a long day but worth it.
Day Trip Direct from Phuket (Less Recommended)
Some Patong and Kata operators sell "Similan day trips from Phuket." These typically involve a 3+ hour speedboat ride each way, leaving you barely 2–3 hours at the islands. The sea can also be rougher on the longer route. Spend a night in Khao Lak instead if you want to do this properly.
Liveaboard (Best for Divers)
Spend 2–4 nights aboard a dive boat, visiting 12–18 dive sites including deeper spots like Christmas Point, Shark Fin Reef, and the legendary Richelieu Rock (worth the trip alone). This is the only way to experience the full Similan archipelago including the northern islands that day-trippers can't reach.
| Option | Duration | Sites Visited | Cost (per person) | Best For |
|---|---|---|---|---|
| Day trip (Khao Lak) | 1 day | 3–4 | ฿2,500–3,800 | Snorkellers, first-timers |
| Day trip (Phuket) | 1 day | 2–3 | ฿3,500–5,000 | Convenience seekers |
| Liveaboard (2 nights) | 2 nights/3 days | 10–14 | ฿8,000–14,000 | Divers, enthusiasts |
| Liveaboard (4 nights) | 4 nights/5 days | 18–22 | ฿18,000–35,000+ | Serious divers |
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Join The Phuket Insider →The 11 Similan Islands — What to Know
The islands are numbered 1 through 11 (with islands 1–3 now closed to visitors to protect turtle nesting sites). The main islands open for tourism are:
Island #4 — Ko Miang
The park headquarters island. Overnight camping, bungalows, visitor centre. Fantastic beach and snorkelling right off the shore. Turtle sightings common.
Island #7 — Ko Payu
The scenic highlight. Granite boulders towering above a white beach, framed by impossibly turquoise water. Every Similan postcard was taken here.
Island #8 — Ko Similan
The largest island, with excellent snorkelling at Beacon Beach on the west side. Donald Duck Bay is famous for its unique rock formation.
Dive and Snorkel Sites Not to Miss
For divers, the Similans offer a split personality. The east side has gentle slopes and abundant reef fish. The west side has dramatic swim-throughs, walls and pelagics — manta rays, whale sharks (Nov–April), and reef sharks year-round.
| Site | Type | Depth | Highlights |
|---|---|---|---|
| Richelieu Rock | Pinnacle | 5–35m | Whale sharks, mantas, seahorses — voted world's best dive site |
| East of Eden (Island #7) | Reef | 10–30m | Staghorn coral, turtles, barracuda schools |
| Elephant Head Rock (Island #8) | Boulders | 15–30m | Swim-throughs between granite boulders, leopard sharks |
| Christmas Point (Island #9) | Wall/slope | 10–30m | Soft corals, reef sharks, massive visibility |
| Beacon Beach (Island #8) | Snorkel/shallow | 0–8m | Excellent snorkelling, colourful reef, beginner-friendly |
Choosing a Tour Operator
The Similan Islands trip is sold everywhere in Phuket — from luxury resorts to Patong touts. Quality varies enormously. Things to check:
- Group size: Speedboat day trips should have no more than 20–30 people. Packed tours with 40+ are uncomfortable and poor value.
- Departure point: Confirm whether the boat leaves from Khao Lak or Phuket. The difference in time at sea is significant.
- Equipment condition: For diving, ask about regulator service dates. For snorkelling, good-quality masks matter in clear water.
- Food included: Most day tours include lunch (Thai food on the boat). Confirm what's included before booking.
- National park fee: The ฿500 foreigner entry fee should be included. If the price seems too cheap, ask whether it's included.
Well-regarded operators running from Chalong Pier or Tab Lamu include Sea Bees Diving, Similan Seven Seas, and Phuket Dive Tours. For liveaboards, MV Halcyon, Warp Speed, and Xscape are consistently well-reviewed by the dive community.
Practical Information
What to Bring
- Reef-safe sunscreen (chemical sunscreens are harmful and technically banned in the park)
- Rash guard or wetsuit (even in Thai waters, a long session in the sun burns)
- Cash in THB — there are no ATMs on the islands
- Motion sickness medication if you're susceptible (the speedboat crossing can be rough)
- Underwater camera (or a GoPro waterproof housing — the visibility makes photography exceptional)
Overnight Camping on the Similans
It's possible to camp overnight on Ko Miang (Island #4) in DNP-managed tents (฿180/person/night) or bungalows (฿2,000–3,000). Bookings through the national park website. Availability is limited and popular — book weeks ahead during peak season. Early morning and late afternoon are when the wildlife is most active and the other tourists are gone.
Don't touch coral — even brushing it causes damage. Don't feed fish. Don't take shells or sand. Rangers do enforce rules and fines apply. Don't book through random Patong beach touts without checking the operator name and reviews first.
Similan Islands vs Other Day Trips from Phuket
If you're trying to decide between Similans and other options:
| Destination | Travel Time | Best For | Season |
|---|---|---|---|
| Similan Islands | 2–2.5 hrs (Khao Lak) | World-class diving/snorkelling | Oct–May only |
| Koh Phi Phi | 1.5–2 hrs | Scenery, swimming, Maya Bay | Year-round (choppy Oct–Nov) |
| Racha Yai/Noi | 45–60 min | Easy diving, calm water | Year-round |
| Phang Nga Bay | 1–1.5 hrs | Kayaking, limestone scenery | Year-round |
| Surin Islands | 3 hrs (liveaboard only) | Moken sea gypsy culture, pristine reef | Oct–May only |
For diving specifically, the Similans are in a different league from anything accessible from Phuket's southern shore. For a day trip combining scenery and snorkelling, Phi Phi is the easier choice. If you want world-class diving without the Khao Lak transfer, Racha Yai is consistently excellent.
More on Phuket's day trip options: Day trips from Phuket: the complete guide. For diving specifically from Phuket's Chalong pier: Scuba diving in Phuket guide. And for planning your whole time here: Start Here — your Phuket relocation roadmap.
FAQ: Similan Islands from Phuket
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