Similan Islands Day Trip from Phuket: Speedboat, Season & Cost Guide (2026)

Category: Day Trips  |  Published: 2026-07-20  |  By Andatel Grande Patong Phuket

Similan Islands day trips from Phuket run by speedboat only from mid-October to mid-May, taking roughly 1.5–2 hours each way, with turquoise water and coral snorkeling as the main draw. Outside that window, the national park closes entirely to let the reef recover from monsoon swell, which trips up more visitors than any other planning detail. Having watched guests scramble to rebook Similan trips from Patong more than once, we've seen how a single missed date on the calendar can undo an otherwise well-planned Phuket holiday. This guide breaks down exactly when the islands are open, how a speedboat day trip compares to a multi-day liveaboard, what a typical departure actually involves, and what you should realistically budget — so you can book with confidence rather than guesswork.

Where Are the Similan Islands and How Far From Phuket?

The Similan Islands are a chain of nine granite islands in the Andaman Sea, roughly 60–70 km northwest of Phuket, protected as Mu Ko Similan National Park. Most day-trip boats don't leave from Phuket itself — they depart from piers further north, near Khao Lak in Phang Nga province, with a road transfer from your Phuket hotel included in the package.

That transfer is usually the longest part of the day: expect 1–1.5 hours by road from Patong to the pier, then another 1–2 hours by speedboat out to the islands. If you're staying at Andatel Grande Patong on Rat-U-Thit 200 Pee Road, most operators' pickup points are only minutes away, which matters more than it sounds on a trip with a genuinely early start.

When Can You Visit? Understanding the Seasonal Closure

The Similan Islands are open to visitors from mid-October to mid-May only; the park closes completely during the southwest monsoon, typically mid-May through mid-October. This is a hard closure, not a weather-dependent maybe — no speedboats, liveaboards, or overnight camping are permitted on the islands during these months.

The closure exists to let coral reefs and beaches recover from monsoon swell and to reduce visitor pressure, a policy set by Thailand's Department of National Parks. If your Phuket trip falls between June and early October, a Similan day trip simply isn't bookable at any price — worth checking before you build an itinerary around it. For a broader look at Phuket's weather patterns, see our guide to the best time to visit Phuket.

Peak season for the islands runs December through March, when seas are calmest and visibility is best; the shoulder months of November and April can still be excellent and noticeably less crowded.

Speedboat vs Liveaboard: Which Trip Type Fits You?

A speedboat day trip suits travelers who want a single full day of snorkeling without giving up a hotel bed, while a liveaboard suits divers who want multiple dive sites, night dives, and time at anchor away from other boats.

If you're deciding between the two, ask yourself how much of your Phuket trip you're willing to spend at sea. Divers chasing specific sites like Elephant Head Rock or East of Eden generally get more value from a liveaboard; casual snorkelers get most of the visual payoff from a single well-run day trip. Our Phuket diving guide covers certification options if you're considering adding a course to either trip type.

What's Included in a Typical Day Trip

A standard Similan speedboat day trip includes hotel pickup and drop-off, the return speedboat transfer, park entrance fees, snorkeling gear, a buffet lunch, and stops at two to four snorkeling sites around the islands.

• Early-morning hotel pickup (often before 6:00 AM)
• Road transfer to the pier near Khao Lak
• Return speedboat journey to the islands
• National park entrance fee (paid separately in cash in some packages — confirm when booking)
• Mask, snorkel, and life jacket rental
• Buffet lunch, usually served on board or on a beach stop
• Free time on Similan Beach (Island 8) where boats are permitted to land

Because pickup is so early, a hotel that can arrange a takeaway breakfast or early service is genuinely useful — something worth checking when you book your stay, alongside your airport-to-Patong transfer if you're arriving the day before.

Best Snorkeling Spots Around the Islands

The best Similan snorkeling spots combine shallow coral gardens with granite boulder swim-throughs, and most day trips rotate between two to four of these sites depending on sea conditions.

• Similan Beach (Island 8) — the iconic white-sand bay with a viewpoint hike and calm shallow snorkeling.
• Donald Duck Bay (Island 8) — named for a duck-shaped rock formation, with easy coral access close to shore.
• Christmas Point (Island 9) — deeper granite boulders and a chance of spotting reef sharks in open water.
• Island 4 and Island 5 reef edges — softer coral areas favored for first-time snorkelers.

Visibility is typically best in the morning before wind picks up, another reason the early departure time is worth the discomfort. According to the Tourism Authority of Thailand, the Similan Islands are consistently ranked among the country's top marine destinations for coral diversity.

How Much Does a Similan Islands Trip Cost?

A standard Similan speedboat day trip from Phuket typically costs between 3,000 and 5,500 THB per person, depending on boat size, inclusions, and whether the national park fee is bundled in or paid on arrival.

• Budget speedboat day trip: ~3,000–3,800 THB, larger shared boats
• Mid-range/small-group speedboat: ~4,000–5,500 THB
• National park entrance fee: often 500 THB+ for foreign adults, sometimes paid separately in cash
• Liveaboard (2–3 nights): significantly higher, often several times the day-trip price, and booked as a full package including diving

Prices shift with fuel costs and season, so treat these as a planning range rather than a fixed quote, and always confirm what's included before paying a deposit.

Tips for a Smooth Day Trip

The most useful preparation for a Similan day trip is packing light, protecting your skin, and confirming your pickup time the night before — small things that matter more at sea than on a typical Phuket outing.

• Wear reef-safe sunscreen; standard sunscreen is restricted or banned in the marine park
• Bring a rash guard or light long-sleeve top — sun exposure on open water is stronger than it feels
• Pack seasickness tablets if you're prone to motion sickness; the speedboat crossing can be choppy
• Bring cash in small denominations for park fees or extras not included in your package
• Confirm pickup time and location the evening before, since times can shift with weather