Similan liveaboard guide

Liveaboard or day trip: the real trade-off

A liveaboard means sleeping on the boat for two to four nights and diving four to five times a day, including sunrise and night dives, at sites a same-day boat from Phuket physically can’t reach in the time available. A Similan day trip gets you two or three dives at the closer islands — usually Islands 7, 8 and 9 — with a 2.5 to 3 hour crossing each way eating into the day. If your certification level, budget and schedule all line up, the liveaboard is the better dive trip. If any one of those doesn’t, the day trip is a legitimate way to see the Similans without the commitment, and it’s worth reading honestly before you book either one.

The islands themselves sit roughly 60–70km northwest of Khao Lak and further still from Phuket, which is why almost every liveaboard actually departs from Khao Lak or Tap Lamu Pier rather than Phuket — a detail that catches people out when they book a “Similan liveaboard from Phuket” and then discover the first leg is a 90-minute transfer up the coast before they even see a boat.

Boat types and cabin classes

Similan liveaboards range from converted local fishing boats refitted for diving to purpose-built dive yachts with air conditioning throughout. Three rough tiers:

Tier	Cabins	AC	Typical price/night	What you get
Budget	Shared 4–6 berth, fan-cooled	Common areas only	3,000–5,000 B ($85–140)	Basic bunks, shared bathroom, functional food
Mid-range	Twin or triple, private bathroom	Cabin AC	6,000–9,000 B ($170–255)	Proper mattress, hot water, decent kitchen
Premium	Double/twin, en-suite	Full AC	10,000–18,000+ B ($285–510+)	Larger cabins, sun deck, better crew-to-diver ratio

Whatever tier, expect a small cabin — liveaboards aren’t cruise ships. Bunks are narrow, storage is limited to a shelf and a hook, and on budget boats the engine noise carries into the cabin at night. If you’re prone to claustrophobia, ask specifically about cabin dimensions and window placement before paying; some operators will only describe cabins as “cosy.”

How many nights actually make sense

Two-night/three-day trips are the standard entry point and cover the southern and central Similan islands adequately for most divers. Four-night trips add Koh Bon, Koh Tachai and — conditions permitting — Richelieu Rock near the Myanmar border, which regularly produces the best single dives most people do in Thailand, including a realistic (not guaranteed) chance of a whale shark between roughly February and April. If your two priorities are Richelieu Rock and whale sharks specifically, don’t book a two-night trip assuming you’ll reach it — ask the operator to confirm Richelieu is on that specific itinerary, since not every departure includes it.

Certification and experience required

Most liveaboards accept Open Water certified divers, but the deeper sites and stronger currents at Koh Bon and Koh Tachai are genuinely more demanding than the sheltered bays most people trained in. If you’re newly certified with fewer than 10–15 logged dives, say so honestly when booking — a good operator will pair you with a more attentive guide or suggest a gentler itinerary rather than turning you away, but a bad one will just put you in the water and hope for the best.

If you’re not yet certified, do the PADI Open Water course in a pool and sheltered bay first; a liveaboard is the wrong place to learn basic buoyancy control. Divers coming from scuba diving in Phuket for beginners territory — Racha or Coral Island single-tank dives — should treat a Similan liveaboard as a step up, not a lateral move.

Seasickness and the crossing

The crossing from Khao Lak to the Similans takes two to three hours each way by liveaboard, longer than the speedboat day-trip crossing, and open-water swell can make the first few hours uncomfortable even in the November–April dry season. Take motion sickness medication (Dramamine or a scopolamine patch) before boarding, not after you start feeling queasy — it doesn’t work retroactively. Choose a cabin toward the boat’s centre if you have a choice; the bow and stern pitch the most. Crew on most boats are used to seasick guests and will point you toward fresh air and the horizon rather than below deck, which genuinely helps.

The park’s hard seasonal closure

The Similan Islands are a national park with a mandatory closure, typically from mid-May through mid-October, to let the reef and nesting sea turtles recover from the southwest monsoon and tourism pressure. This isn’t a soft recommendation — the park is physically closed, and no operator can land you there or run a liveaboard through it during the closure window, regardless of what a booking site shows for those dates. If you’re planning a trip for low season, check the Phuket monsoon season guide and confirm current closure dates directly with the operator before you commit flights, since the exact reopening date shifts slightly year to year depending on conditions.

Full-day Similan Islands scuba diving trip

What a typical day actually looks like

Wake before sunrise for an optional first dive, breakfast between dives one and two, a surface interval with fruit or snacks, dive three around midday, lunch, a rest period, dive four in the late afternoon, dinner, and — on some boats — an optional night dive. It’s a full schedule with genuine downtime built in rather than a relentless one; most divers do three to four dives a day rather than the maximum five, since fatigue and cold add up faster than people expect on a multi-day trip.

The realistic budget

Beyond the nightly cabin rate above, budget for:

• Equipment rental (if you don’t own gear): 300–600 B ($8–17) per day
• Nitrox (optional, extends bottom time): 200–400 B ($6–11) per day
• Marine park fees: usually 200–800 B ($6–23) depending on trip length, sometimes bundled into the price — confirm
• Crew tips: 500–1,000 B ($14–28) per diver for a 2–4 night trip, paid in cash at the end
• Transfer from Phuket to Khao Lak/Tap Lamu: often included, but check — some budget operators charge 500–1,000 B extra

All-in, a two-night liveaboard from Khao Lak runs roughly 12,000–20,000 B ($340–570); a four-night premium trip with Richelieu Rock can run 35,000–55,000 B ($1,000–1,570) or more. For a broader sense of how this fits a wider trip, see the Phuket trip budget guide and is Phuket expensive.

Liveaboard vs day trip vs snorkelling

	Similan liveaboard	Similan day trip	Snorkel-only day trip
Certification needed	Open Water minimum	Open Water minimum	None
Sites reached	Full island chain, Koh Bon, Koh Tachai, Richelieu Rock (conditions permitting)	Southern/central islands only	Shallow reef near the boat
Nights away	2–4	0	0
Typical cost	12,000–55,000+ B ($340–1,570+)	4,500–9,000 B ($130–255)	3,500–6,500 B ($100–185)
Best for	Certified divers chasing specific sites and pelagics	Divers short on time or budget	Non-divers, families, first-timers

If you’re not sure which category you fall into, snorkelling vs diving in Phuket walks through the decision in more depth, and best snorkelling spots in Phuket covers closer, cheaper alternatives if the Similans specifically aren’t the draw.

Khao Lak to Similan Islands early-bird day trip

Booking tips that actually protect you

• Book direct with a dive shop you can verify, not just the cheapest listing — liveaboard cabins are a fixed, perishable inventory and reputable operators sell out first in high season (December–March especially).
• Ask which sites are confirmed, not just “the Similans.” Itineraries get adjusted for weather; confirm Richelieu Rock or Koh Bon are actually planned if that’s why you’re booking.
• Check the diver-to-guide ratio. Four divers per guide is reasonable; eight or more on a budget boat means less attention if something goes wrong at depth.
• Confirm what’s included — nitrox, equipment, park fees and transfers vary a lot between listings that look similar on price.
• Buy dive-specific travel insurance. Standard travel policies often exclude scuba diving beyond a shallow depth limit; see travel insurance for Thailand before you rely on an assumption.

When to go and when to skip it

November through April is the full season, with February to April generally calmer and offering the best odds of whale shark sightings at Richelieu Rock. Early season (November) can still have residual swell from the tail of the monsoon. If your trip dates fall in the closure window, don’t try to force it — pivot to the King Cruiser wreck or Racha Islands, both of which stay open and diveable year-round, and check diving season in Phuket for a fuller month-by-month picture.

A sample two-night, three-day itinerary

Itineraries vary by operator, but a typical two-night trip runs roughly like this:

• Day 1: Morning pickup and transfer to Tap Lamu Pier, boarding, safety briefing and gear check. Afternoon check dive at a sheltered southern island to confirm weighting and buoyancy before the itinerary moves further out. Dinner and an optional night dive.
• Day 2: Two morning dives at central islands (commonly Island 8 or 9), a surface interval with a proper lunch, an afternoon dive further north, and — conditions permitting — an attempt at Koh Bon or Koh Tachai for a chance at manta rays. Dinner, briefing for the next day.
• Day 3: An early dive, breakfast, a final dive at a site chosen for calm conditions before the return crossing, then the boat heads back to Tap Lamu for an afternoon disembarkation and transfer.

Four-night trips extend this pattern with a full day added at the northern sites, including Richelieu Rock if the itinerary and conditions allow, and generally build in more rest between dives rather than cramming in extra tank time.

Reading reviews and spotting red flags before you pay

Liveaboard listings on booking platforms often look near-identical at a glance — same islands, similar photos, comparable prices — which makes it hard to tell a well-run boat from a corner-cutting one from the listing alone. A few things worth checking specifically: recent reviews (within the last six months, not just historic ones — crew and management change), whether reviewers mention the actual dive sites reached versus a vague “amazing trip,” and whether the operator answers pre-booking questions about certification requirements honestly rather than just saying yes to book the sale.

A shop that pushes back gently on an under-qualified diver, or asks for your logged dive count before confirming, is usually the more careful one — not a red flag in itself. Be more cautious of listings with unusually low prices relative to the tier of boat described; liveaboard economics (fuel, crew, food, marine park fees for multiple days) don’t leave much room for a boat to be dramatically cheaper than comparable options without cutting something, often maintenance or diver-to-guide ratios.

Environmental practices worth checking for

Reef-safe sunscreen policies, proper mooring buoy use rather than anchoring directly on reef, and a genuine briefing on not touching or standing on coral are all reasonable things to ask about before booking, and a good operator will have clear answers rather than a shrug. The Similans are a protected marine park specifically because of past damage from unmanaged tourism — the same pressure that led to Maya Bay’s 2018–2022 closure elsewhere in the region — and the operators still running trips here have a direct stake in keeping the reef in a state worth returning to.

Packing specifics beyond the standard dive kit

Beyond dive gear, pack for genuine time at sea with limited resupply: reef-safe sunscreen (some liveaboards now require it explicitly and will refuse standard lotion sunscreen at the point of boarding), a light jacket or hoodie for the open deck at night or during the crossing, seasickness medication regardless of how confident you feel about your sea legs, a dry bag for electronics, and cash in small baht notes for tips and any extras not included in the package price — card machines are unreliable or absent entirely once you’re away from the mainland for several days.

Frequently asked questions about Similan liveaboards

Do Similan liveaboards leave from Phuket or Khao Lak?

Almost all of them depart from Khao Lak or Tap Lamu Pier, about 90 minutes north of Phuket by road. Operators selling a “Phuket liveaboard” are usually including the road transfer in the package — confirm this before you book so you’re not caught off guard on pickup morning.

How many dives do you actually do on a liveaboard?

Typically three to four dives a day, sometimes with an optional night dive. Five-dive days exist on some itineraries but most divers skip the fifth once fatigue sets in.

Is a liveaboard safe for a first-time diver?

You need an Open Water certification at minimum, and ideally some open-water experience beyond your training dives. A liveaboard isn’t the place to learn — get comfortable at a sheltered site like Racha Islands first.

What’s the minimum age for a Similan liveaboard?

Most operators set a minimum of 10–12 years old for the boat itself, and diving certification bodies generally require 10+ for Junior Open Water. Confirm directly with the operator if travelling with a younger diver.

Can non-divers come on a liveaboard?

Some boats accept snorkellers at a reduced rate, sharing the same itinerary but staying on the surface. It’s not the norm — check specifically before assuming a non-diving partner can join cheaply.

Is the Similan liveaboard worth it if I only have three days in Phuket?

Probably not. Between the transfer to Khao Lak and the trip length itself, a liveaboard eats most of a short trip. A Similan day trip or a dive at Racha Islands fits a tight schedule far better.