How to Plan a Sail Rock Day Trip from Koh Tao (2026 Guide)
If you have spent any time researching diving in Thailand, you will have come across Sail Rock Koh Tao more than once. The site sits between Koh Tao and Koh Phangan in the Gulf of Thailand. As it requires a dedicated full-day trip rather than a quick boat ride, a lot of divers on the island put it off until the last day of their trip or miss it entirely.
This is the mistake worth avoiding. Thailand’s Tourism Authority recorded 32.9 million international arrivals in 2025, and Koh Tao consistently draws a significant share of those looking specifically for world-class diving.
Sail Rock is one of the reasons many of them extend their stay. If you are already on the island, here is how to plan the day properly.
What You Are Actually Going To See
Sail Rock, also known as Hin Bai, is a granite pinnacle that breaks the surface by about 10 to 15 metres and then drops underwater to depths beyond 40 metres. The signature feature is a vertical swim-through chimney that cuts through the rock and opens at around 18 metres.
On most days, you’ll find dense schools of barracuda circling the upper sections of the pinnacle, large-eyed trevally moving in tight formation through the water column, and batfish sitting almost motionless near the rock face.
Between March and May, whale shark spotting becomes more frequent, though no operator will guarantee them. You go with the understanding that the ocean decides what shows up.
| Did You Know? According to data from the Department of Marine and Coastal Resources and the Marine Megafauna Foundation, between 1991 and 2023, a total of 1,409 whale shark observations were recorded across Chumphon Pinnacle, Koh Tao, and Sail Rock combined, accounting for 48% of all whale shark sightings throughout Thailand during that period |
Who Can Do This Trip
Most dive shops that offer a Sail Rock dive Koh Tao trip list it as suitable for divers with an Open Water certification, but this needs some honest qualification. The site is open ocean, which means currents can arrive without much warning and visibility can change between dives on the same day.
Divers who have only completed their certification pool sessions and four training dives may find the conditions more challenging than they expected. If you have ten or more logged dives and feel comfortable equalising quickly and managing your buoyancy in a current, you will have a much better experience.
Advanced Open Water certified divers tend to get the most out of the deeper sections of this site and the chimney itself. Beginner-friendly doesn’t mean effortless at Sail Rock, and going in with realistic expectations matters more here than at most sites you will visit around the island.
What a Typical Day Looks Like
Most Koh Tao dive schools organise Sail Rock diving as a full-day trip, and the schedule follows a fairly consistent pattern across operators.
- Most boats leave from the main power area between 7:30 and 8:00 in the morning. The ride out takes approximately 90 minutes on a standard dive boat, though speedboat operators cover the same distance in 40 to 45 minutes, which adds useful time to your diving day. Breakfast is usually served on board during the crossing.
- Most Sail Rock trips include two dives with a relaxing 45-minute surface interval in between. This gives divers time to hydrate, grab a snack, and enjoy the views. Some dive centers also add a third dive at a nearby site on the way back to Koh Tao.
- Lunch comes out after the second dive, usually a Thai spread served on the boat during the ride back, and most trips are back at the pier somewhere between 1:00 and 3:00 in the afternoon. The full day from the time you leave to the time you step off the boat is roughly six hours, sometimes a little more if the sea is choppy on the return.
- A trip to Sail Rock in 2026 will generally cost between 2,500 and 3,500 Baht. This normally covers everything you will need, including the rental of your equipment, the guide, food on the boat, and the national park fee. Usually, the difference comes down to whether you’re on a speedboat or a slower boat and how many divers the operator puts on the boat.
| One timing note worth keeping in mind: If you book a noon departure, you will find the site noticeably quieter than the morning rush. Sail Rock gets busy at weekends when multiple boats arrive around the same time, so a weekday trip is worth considering if you prefer more space underwater. |
Wrapping It Up
Koh Tao remains one of the most affordable dive destinations in the world, and a day trip to Sail Rock from Koh Tao is a great value compared to what a similar offshore pinnacle dive would cost you in the Maldives, Australia, or the Caribbean. Plan the day properly, choose your diving school with some consideration, and it will probably be the dive you talk about most when you get home.
