Similan Islands Yacht Charter 2026: The Honest Destination Guide

Every January my inbox fills with the same question. "We're in Phuket in March — should we do a similan islands yacht charter instead of Phi Phi?"

Fair question. And almost every destination guide on the first page of Google dodges it. Nobody tells you the park closes for five months. Nobody tells you that you can't legally sleep at the Similan Islands anymore. Nobody lists which islands are closed to landing at all.

This guide does.

I run a Phuket charter desk. I quote a similan islands yacht charter to a handful of clients every season and I talk at least three out of it every year — not because Similan isn't remarkable, but because it isn't what they thought they were booking. The Similan Islands are one of the best tropical diving destinations on the planet and one of the most mismatched destinations for a lifestyle charter. Both things are true. Below is the honest version — closures, fees, dive sites, distances, the no-overnight rule.

Are the Similan Islands open in 2026?

The single most searched question. Also the single most important one, because the Similans close for roughly five months every year.

2026 open season: approximately October 15, 2026 — May 14, 2027. The park closes May 15 and reopens mid-October. The Department of National Parks has run this annual closure since 2018 to let the reef recover from high-season traffic. The dates rarely move more than a day or two.

What that means for a similan islands yacht charter:

• November through April is the only window. Peak is late February through April.
• May 15 to October 14/15 the park is fully closed. No anchoring, no mooring, no diving in park waters. Any operator quoting a Similan trip inside that window is misleading you.
• Opening day usually falls October 14-16. I don't lock a first-week date until the DNP announcement in late September.

If your trip is June-September, the Similans are off the table. Phang Nga Bay and Phi Phi stay open year-round. That's the honest answer nobody on the first page of Google publishes.

What a similan islands yacht charter actually is

A similan islands yacht charter is not the same product as a Phi Phi charter, a Phang Nga Bay day trip, or a Racha Yai afternoon. It has a specific shape, driven by three hard facts.

Diving-first. The Similans built their reputation on granite-boulder sites — Elephant Head, Christmas Point, East of Eden — and outer-park big-animal sites: Ko Bon for mantas, Ko Tachai for whale sharks, Richelieu Rock (technically Surin NP, always bundled) for the best whale-shark density in the Andaman. Roughly 80% of the clients I send to Similan are there to dive.

Remote. 55 nautical miles northwest of Chalong — more than twice the distance to Phi Phi. 1.0 to 3.5 hours each way depending on your boat. Fuel adds up fast on a motor yacht day run.

Seasonal and tightly regulated. Closed five months a year. No overnight stays in park waters since 2018. Mooring-only. Daily visitor cap 3,325, diver cap 525. Mandatory e-ticket since October 2024. Snorkeller buoyancy aids required from the 2026 season.

The market separates into two products:

1. 3-5 day liveaboard — the flagship format. Vessels sleep outside park waters or transit overnight, running back in for dawn dives. 90% of serious Similan itineraries land here.
2. Long day charter — private yacht running 55 NM out, 6-8 hours at the moorings, 55 NM back before sunset. Expensive per hour, but the only option for families who want one big day.

Almost nothing in between works. The no-overnight rule kills the casual cruise.

The 11 Similan Islands: what's open, what's closed, what you can land on

Most guides call it "the Similan Islands" as if there were 11 interchangeable bays. There aren't. Three are permanently closed to humans for turtle nesting. Two are the only ones you can land on. The rest are dive sites or day-use viewpoints.

Only Ko Miang (island 4) and Ko Similan (island 8) let you set foot on dry land. Two landing beaches — the whole lineup.

Ko Miang has the ranger station, the e-ticket scan point, and Honeymoon Beach snorkelling. Ko Similan has Donald Duck Bay and the Sail Rock viewpoint — the granite boulder climb for the photo you've seen a thousand times. Everything else is underwater.

The no-overnight rule — why you can't sleep in the park

This catches every client off guard. Since the Royal Gazette ruling of October 2018, overnight stays on any Similan island — and anchoring in park waters after sunset — have been prohibited. Charter yachts must exit park boundaries by dark or pick up a mooring outside.

It came in for reef protection. It stayed because it works. And it reshapes the entire charter product.

For a liveaboard, the rule means the vessel runs back outside the park each evening or anchors offshore. You sleep on the boat, just not inside the park. Guests barely notice. For a private yacht charter hoping to drop the hook in Donald Duck Bay under the stars, it's a hard no. Not legal, not happening.

The mooring system. The DNP installed government mooring buoys from 2018 onward at every legal anchorage and dive site. Direct anchoring on coral is prohibited and enforced with fines of 5,000 to 100,000 THB. Every similan islands yacht charter picks up a pre-assigned mooring through the e-ticket system.

If you want a granite-boulder sunrise at anchor, Similan cannot give you that legally — book Phi Phi or Phang Nga Bay. If you want to dive Richelieu Rock before April ends, the rule is irrelevant and the liveaboard format handles it.

How far are the Similan Islands from Phuket?

Further than most expect. This is the biggest obstacle to a day charter and the reason liveaboards dominate the similan islands yacht charter market.

Thap Lamu is the dominant commercial departure — the mainland pier closest to the park, about a 90-minute drive north of Phuket town. Every day-trip speedboat operator leaves from there. A private yacht charter from Phuket marinas adds 17-22 nautical miles because you're starting further south.

The implications for planning:

• Speedboat from Thap Lamu — best day-trip format. 1 hour out, 6-7 hours at the park, 1 hour back.
• Motor yacht from Chalong — 7 hours of transit for 4-5 hours at the park. Expensive and exhausting.
• Sail cat day charter — doesn't work. 14-18 hours round trip leaves no time at the destination. Sail cats belong on liveaboards, not day runs.
• Liveaboard from Thap Lamu — the format the park was practically built around. Dawn dives Ko Bon, Ko Tachai, Richelieu Rock over three or four days.

The 55 NM distance is why Similan pricing sits 30-40% above Phi Phi day-charter pricing for an equivalent boat.

The dive sites that make the trip worth it

If you're a diver, this is why you go. The Similans aren't the best beach destination in Thailand. They're the best tropical diving in the country, and most people who book a similan islands yacht charter do it because of what's in this table.

Richelieu Rock is the trip-maker. Not technically in Mu Ko Similan — it sits in Mu Ko Surin — but every Similan liveaboard runs to it. February through April is peak whale-shark season. Off-peak you still get purple soft coral and barracuda.

Ko Bon is the reliability play. Mantas year-round, the most consistent big-animal encounter in the Andaman. If the whale sharks have thinned out in April, Ko Bon is why you still booked.

Ko Tachai is the wildcard. When it's on, it's the best dive of the trip — whale sharks through schooling trevally. When it's off, a fast drift over an empty pinnacle. I've had clients who saw three whale sharks in one dive and clients who saw none across five dives the same week.

If you're not a diver, the Similans are a scenic day trip with excellent snorkelling at Donald Duck Bay and Honeymoon Beach. A fine trip. But it's not the reason the Similans have the reputation they do.

Similan vs Phi Phi — which charter fits you?

The comparison almost every first-time visitor runs. Let me answer it plainly.

Book Phi Phi if: you want beaches, lifestyle, overnights at anchor, year-round availability, short transit, and limestone cliffs. Phi Phi is 26 NM from Phuket, open all year (except Maya Bay's Aug-Sep closure), permits overnight anchoring in most bays, and works for families who want one unforgettable day or a 2-4 night cruise.

Book Similan if: you dive, you're here November through April, you're willing to do a liveaboard or a long day run, and your trip is built around the reef. Similan is 55 NM from Phuket, closes May 15 to mid-October, prohibits overnights in park waters, and rewards you with some of the best visibility in Southeast Asia.

The mistake I see most often is a family treating Similan as "Phi Phi but further." It isn't. A full week-long yacht charter can absolutely include both — Phi Phi two nights, Phang Nga one, a Similan liveaboard leg — but they're separate chapters, not interchangeable options.

Park fees, caps, and the 2026 buoyancy aid rule

Mu Ko Similan National Park has the most structured fee and access regime of any Thai marine park.

Entry fees (2026 schedule)

• Foreign adult: 500 THB per day
• Foreign child: 300 THB per day
• Thai adult: 100 THB per day
• Thai child: 50 THB per day
• Surin NP add-on (required if diving Richelieu Rock): 500 THB per day

Fees are collected via the e-ticket system, mandatory since October 15, 2024. No cash at the pier. Your operator books the e-ticket in advance and it gets scanned at Ko Miang on arrival.

Daily caps

• Total visitors: 3,325 per day (reduced from 3,850)
• Divers: 525 per day
• Boats: capped by mooring availability, roughly 50-60 vessels in park waters

New for 2026: the buoyancy aid rule. All snorkellers inside park waters must now wear a flotation device — life vest, pool noodle, or snorkel vest. The DNP introduced it after ongoing reef-contact damage from tired swimmers. Not optional, applies to everyone regardless of swimming ability.

Fines for anchoring, exceeding moorings, or snorkelling without a buoyancy aid: 5,000 to 100,000 THB.

What a similan islands yacht charter costs in 2026

Pricing bands are tighter on this page than on the Phi Phi guide because Similan's format is less variable. The day-charter floor is higher (further distance, more fuel), and the flagship product is the liveaboard per-person tier, not a whole-boat day rate.

Add-ons on top of the quoted number

• 500 THB per person per day park fee (foreign adult)
• 500 THB per person per day Surin NP add-on for Richelieu Rock
• 7% Thai VAT (confirm net or inclusive)
• 30-35% APA on crewed weekly charters
• Fuel surcharges on motor yacht day runs can add 10-20%

The 4-day, 4-night liveaboard at 700-1,100 USD per person is where most of the market lives. Mid-tier vessel, 11-14 dives including Richelieu Rock, full guide services, full island circuit. Below that, you're on a budget boat with shared cabins. Above, premium catamarans with private cabins. All three tiers deliver the dive sites. The difference is how you sleep.

Frequently asked questions

Are the Similan Islands open in 2026? Yes — approximately October 15, 2026 through May 14, 2027. The park closes annually May 15 to mid-October for reef recovery. No similan islands yacht charter can legally operate inside park waters during the closure.

How much does a similan islands yacht charter cost? A private day charter from a Phuket marina starts around 42,000 THB (1,190 USD) for a budget whole-boat and runs to 400,000 THB (11,320 USD) for luxury. Liveaboards price per person at 450-650 USD budget to 2,200-3,500 USD luxury for 4 days 4 nights.

Can you stay overnight at the Similan Islands? No. The Royal Gazette ruling of October 2018 prohibits overnight stays on any Similan island and in park waters. Liveaboards sleep outside park boundaries or transit overnight. Day charters must exit park waters by sunset.

How far are the Similan Islands from Phuket? 55 nautical miles (102 km) from Chalong Pier direct. 38 NM from Thap Lamu Pier in Phang Nga — the commercial departure point. Speedboat transit from Thap Lamu runs about 1 hour; from Phuket marinas, 1.5 to 2 hours. Motor yachts run 3.5 to 4 hours from Phuket.

Which is better: Similan Islands or Phi Phi Islands? They're different products. Phi Phi is year-round, closer (26 NM), allows overnight anchoring, and rewards lifestyle charter. Similan is seasonal (Nov-Apr only), further (55 NM), no overnight, and rewards diving. Divers pick Similan. Families and beach-first charterers pick Phi Phi.

How much is the Similan Islands entrance fee in 2026? 500 THB per day for foreign adults, 300 THB for foreign children, 100 THB for Thai adults. Divers going to Richelieu Rock pay an additional 500 THB Surin NP add-on. All fees via mandatory e-ticket booking, not cash at the pier.

Is Richelieu Rock part of a Similan charter? Technically Richelieu Rock sits in Mu Ko Surin National Park, not Mu Ko Similan, but almost every similan islands yacht charter bundles it — it's the region's signature dive and only 18 NM north of Ko Tachai. A Surin NP entry fee applies on top.

How many days do you need at the Similan Islands? For divers, 4 days 4 nights is the liveaboard sweet spot — 11-14 dives including Richelieu Rock, Ko Bon, Ko Tachai. For non-divers, a single long day trip from Thap Lamu covers Ko Miang, Donald Duck Bay, and 2-3 snorkel stops. Two-day trips are rare because the overnight rule makes them awkward.

When do the Similan Islands close for the season? May 15 annually. Reopens approximately October 15. Dates stable since 2018. The Department of National Parks announces the exact reopen date each September.

Do I need to be a diver to charter the Similan Islands? No. Snorkelling at Donald Duck Bay, Honeymoon Beach, and the shallows around Ko Miang is excellent — buoyancy aids now required under the 2026 rule. That said, roughly 80% of the charter clients I send to Similan are there to dive. If you're not, Phi Phi or Phang Nga Bay is usually a better fit.

Final word

A similan islands yacht charter is a specialist trip. It rewards the traveller who understands what it is — seasonal, regulated, diving-first, run out of Thap Lamu more than Phuket — and disappoints the traveller who expected Phi Phi with better visibility. If you're here November through April, if you dive or love underwater photography, and if you're willing to do a liveaboard or a long day run, the Similan Islands are one of the best charters in Southeast Asia. If you're here in July, or you wanted to sleep at anchor under the granite boulders, book something else. That's the honest version nobody else on the first page of Google will tell you.