6 Best Khao Lak Diving Trips: Sites, Season & How to Choose

Featured image: Reinhard Link from Germany, CC BY-SA 2.0, via Wikimedia Commons.

Khao Lak Diving at a Glance

Khao Lak sits on the Andaman coast of Phang Nga Province, directly across from Mu Ko Similan National Park. Boats leave the mainland for offshore reefs, and a local wreck gives you a short half-day option. Your choice comes down to certification level, time available and tolerance for long boat rides. Use the table below to shortlist, then read the six options that follow.

6 Best Khao Lak Diving Trips and Sites

Details were checked in November 2026. Operators set their own prices and trip schedules, so ask each shop for current rates. For a site-by-site breakdown, read our full dive site guide.

1. Similan Islands day trips

Mu Ko Similan National Park is a group of 9 islands in the Andaman Sea, and it is the main reason divers base themselves in Khao Lak. Day boats work sites around Islands 5, 6, 7, 8 and 9. Our guide to Similan trips from Khao Lak covers piers and boat logistics. Operators describe Island 8 as the Turtle Rock site with table corals. Island 9 is described as an easy dive for octopuses and schooling fish.

Best fit: Open Water divers who want one full day offshore without sleeping on a boat. Trade-off: the crossing is long, and divers prone to sea-sickness should plan for it. Skip a day trip if you only have a few hours free.

2. Koh Bon and Koh Tachai

Koh Bon and Koh Tachai lie beyond the main Similan group and are usually dived on longer outings or liveaboards. Operators market both for manta ray and turtle encounters. Treat those as possibilities, not promises. These sites usually appeal to divers with more logged dives, since currents can be stronger offshore.

Best fit: Advanced divers or confident Open Water divers diving with a guide. Trade-off: more travel time per dive. Skip them if your trip is short or your dive count is still low.

3. Richelieu Rock and Mu Ko Surin

Richelieu Rock is a well-known offshore pinnacle that operators reach by day trip from Khao Lak or by liveaboard. Mu Ko Surin National Park covers 141 km², and 76% of that is sea. Divers come for its coral reef life. Ask your operator which sites are in the plan, because itineraries change with weather and park access.

Best fit: experienced divers who want a destination dive, not a casual reef. Trade-off: longer transfers and a higher cost than local diving. Skip it if you prefer a short day.

4. The local wreck

A tin-mining boat that sank in 1984 is the best-known local dive, and our Boonsung wreck guide covers the details. Operators run half-day trips, so you return to shore by early afternoon. Local wreck outings are also used for training. That makes the site a sensible step for newer divers.

Best fit: divers short on time and anyone who wants wreck experience without a full-day crossing. Trade-off: visibility and marine life vary by conditions. Skip it if your only goal is Similan reefs.

5. Liveaboards

Multi-day boats let you dive the Similans, Koh Bon, Koh Tachai and Richelieu Rock in one trip. You sleep aboard, so each dive costs far less transit time than a day trip. Operators sell options across budget tiers, from basic to comfortable. Compare the number of dives, group size and meals.

Best fit: certified divers with three or more days who want maximum bottom time. Trade-off: a bigger commitment and a fixed schedule. Skip it if you are unsure about long sea time.

6. Discover Scuba and courses

Khao Lak operators teach beginner programs through to rescue diver and specialty courses. Discover Scuba is a supervised first try with no certification needed. Check each operator's health questionnaire and age rules. Training often happens on local sites. Course dives can also be completed at the Similans in season.

Best fit: first-timers, and certified divers who want to upgrade their level. Trade-off: a course takes days, not hours. Skip it if you only want a single casual dive.

Best Time to Dive Khao Lak

Offshore diving from Khao Lak runs roughly October through May. Outside those months, boats to the Similan and Surin islands generally do not operate. Park opening and closing dates are set by Thailand's national parks authority, so check dates before booking flights. Peak months usually mean more boats at popular sites, while shoulder months can bring more variable sea conditions. For monthly detail, read our diving season guide. Wetsuit choice depends on the water temperature.

Day Trip, Liveaboard, or Local Dive: How to Choose

Start with time. A local wreck dive fits a morning, a Similan day trip takes a full day, and a liveaboard needs several days. Budget tiers are relative, so get quotes from at least two operators.

Choosing a Dive Operator

Use a checklist, not a ranking. Our Khao Lak dive shop guide compares the options in more detail. Operators are listed in the SSI dive center locator, which helps you confirm certification affiliations. For one example of an individual shop profile, see this local dive center. Its own site is Sea Dragon Dive Center.

• Certification: confirm instructors and divemasters hold current credentials.
• Group size: ask how many divers go with each guide.
• Equipment: ask about rental condition and tank sizes.
• Insurance: check what dive cover is included and what you need yourself.
• Park fees: ask whether national park fees are in the trip price.
• Briefing: expect a site briefing and a buddy check before every dive.

Marine Life and What You Might See

Operators mention manta rays, turtles and several shark species around the Similans, Koh Bon and Koh Tachai. Sightings depend on season, current and luck. Read our Khao Lak turtle guide for realistic expectations. Octopuses and schools of fish are described at Island 9, and the local wreck is described as home to barracuda. Keep your distance from animals and never touch coral. Thailand's marine and coastal resources department publishes coral protection information.

Getting There and Where to Stay

Phuket International Airport is about 1 hour south of Khao Lak by road. Book transfers in advance and agree the fare before you leave the terminal. Khao Lak stretches more than 30 km along the coast, so pick a base near your dive operator's pickup point. Beach resorts suit families, while smaller guesthouses suit divers on a tighter budget.

Not Diving? Alternatives for Companions

Non-divers can join snorkeling day trips to the same island groups. Our Khao Lak snorkeling guide explains which trips suit beginners. Beaches along the 30 km coast fill a rest day, and local markets offer food and shopping. Pair a snorkeling day for companions with a dive day for you.

Mistakes to Avoid

Do not book an offshore trip outside the October to May window. Do not choose a site above your certification level. Ask whether park fees are included before you compare prices. Follow your dive computer and training on no-fly intervals, and confirm the current guidance with DAN or your agency before flying home.