Answer first: Thailand is a world-class dive destination with a crucial catch for agents — timing. The blue-ribbon area, the Similan and Surin national parks (home to legendary Richelieu Rock), is only open roughly mid-October to mid-May and is reached by liveaboard; miss the window and the parks are closed. Meanwhile the Gulf's Koh Tao certifies beginners year-round and dives well exactly when the Andaman shuts. Sell the right sea in the right month and Thailand offers diving almost all year. As a Thailand DMC for travel agents, Explera books liveaboards and dive packages matched to certification level and season, with transfers and non-diver options, at net rates through our boat charters and activities desks.
The Similan liveaboard — Thailand's blue ribbon
Best for: certified divers, bucket-list clients, Feb–Apr big-pelagic season.
The Similan Islands and the nearby Surin group are why divers cross the world for Thailand: granite boulder swim-throughs, healthy reefs and, at Richelieu Rock, soft-coral walls with seahorses and — from February to April — whale sharks and manta rays. These sites sit far offshore, so the product is a multi-day liveaboard out of Khao Lak/Phuket. The parks close in low season, so the whole Andaman liveaboard business runs on the mid-October to mid-May calendar — book early for the March peak.
Koh Tao — where clients learn to dive
Best for: beginners, certification, budget-conscious divers, year-round.
In the Gulf, Koh Tao is one of the planet's busiest and best-value dive-training islands — warm, shallow, sheltered sites perfect for open-water certification, and it dives well most of the year. It's where you send clients who want to become divers or log easy fun dives, and it pairs naturally with Koh Samui and Koh Phangan for a Gulf-islands week.
The two-sea calendar agents must know
Best for: matching the client's dates to the right coast.
Thailand's great advantage is its two opposite dive seasons. The Andaman (Similan, Phuket's Shark Point and Phi Phi, Krabi) peaks November–April; the Gulf (Koh Tao, Sail Rock, Samui) is the smarter pick May–September when the Andaman parks are shut. Hold that calendar and you can quote Thailand diving in almost any month — just point the client at the sea that's in season, which is exactly what our desk does at the quoting stage.
How agents package Thailand diving
- Match sea to month: Andaman Nov–Apr, Gulf May–Sep. Never sell a closed park.
- Match boat to level: liveaboards for certified divers; Koh Tao resorts for learners and casual fun dives.
- Book the March peak early — whale-shark-season Similan cabins sell out.
- Plan the non-divers: we add island, spa and activity options so mixed groups all have a trip.
- Let the trade desk confirm season, certification and the vessel and quote at net rates; browse all Thailand DMC services that wrap around a dive trip.
Frequently asked questions
When is the Similan diving season?
Roughly mid-October to mid-May — the Similan and Surin parks close in low season. February to April is peak, with the best manta and whale-shark chances.
What is Thailand's most famous dive site?
Richelieu Rock near the Surin Islands — a horseshoe pinnacle famous for soft corals, seahorses and seasonal whale sharks, usually reached by liveaboard. The Similans add dramatic granite swim-throughs.
Where should beginners learn to dive?
Koh Tao in the Gulf — one of the world's busiest, most affordable certification hubs, with calm shallow sites year-round. Andaman liveaboards suit certified divers chasing big pelagics.
Do the Andaman and Gulf have opposite seasons?
Broadly yes — Andaman best Nov–Apr, Gulf best May–Sep. That lets agents offer Thailand diving in almost any month by choosing the right coast.
How do you book a liveaboard?
We reserve the cabin and dive package on a vessel matched to certification level, arrange transfers and pre/post hotels plus non-diver options, and confirm season and requirements up front — one contract, net rates.
