Koh Tao is the most northerly of the three Gulf islands and the furthest from the mainland — a real draw for divers and those who want an island with a bit more edge. Getting there from Surat Thani involves either a fast catamaran that takes 2.5 to 3 hours from the mainland pier, or an old-fashioned overnight slow boat from Surat Thani town. Both work; each suits a different kind of traveller.
Operators and routes
Lomprayah High Speed Catamaran
Lomprayah is the most reliable and well-organised catamaran operator on Gulf routes. Their service departs from Donsak pier (about 1 hour 20 minutes by road east of Surat Thani town) and calls at Koh Samui (Nathon pier) and Koh Phangan (Thong Sala pier) before continuing to Mae Haad pier on Koh Tao's west coast. Total time from Donsak to Koh Tao is roughly 3 hours; if you board at Samui or Phangan, the remaining leg is shorter. Services typically run twice daily — morning and afternoon departures — though exact timetables vary by season. Combined bus-and-ferry tickets from Surat Thani town, Phunphin train station or even from Bangkok are available through Lomprayah's website and major booking platforms.
Lomprayah also operates a departure from Tapee pier near Surat Thani town. This saves the road transfer to Donsak, which is convenient if you arrive by overnight train and do not want to wait for a bus connection. Sailing time from Tapee is longer, roughly 2 hours 30 minutes to Koh Samui and approaching 4 hours to Koh Tao depending on stops.
Songserm Express Boat
Songserm operates a high-speed catamaran from Donsak pier to Mae Haad in around 2 hours 30 minutes. Songserm is a long-established operator on Gulf routes, though travellers often note that Lomprayah's newer vessels and ticketing system make them the slightly more comfortable option. Songserm's service is usually a single morning departure. Check their current timetable, as seasonal schedule adjustments are common.
The overnight slow boat
The night boat from Surat Thani town to Koh Tao is a budget traveller institution. It departs from a pier near Surat Thani town centre in the late evening and arrives at Mae Haad the following morning — roughly a 6–8 hour crossing depending on conditions. The experience is basic: no cabins, just open deck and indoor seating areas. Bring a sleeping mat or rent one on board, a warm layer (the air conditioning can be fierce if you are inside), and ear plugs. Fares are among the lowest on the Gulf, and the journey saves a night's accommodation. In rough weather, however, the slow boat's open-deck crossing can be deeply uncomfortable. It is not recommended during the October–December monsoon.
Getting to Donsak pier from Surat Thani
Most travellers buy a combined bus-and-ferry ticket, which bundles the transfer from Surat Thani town to Donsak with the catamaran crossing. If you are arriving by train, alight at Phunphin station — it is closer to Donsak than Surat Thani town centre, and both Lomprayah and Songserm arrange pick-ups from the station. If you have flown into Surat Thani Airport, shuttle buses to the ferry piers are available.
Arriving on Koh Tao: Mae Haad
Almost all ferries from the mainland arrive at Mae Haad pier on the island's west coast. The pier area is Koh Tao's commercial hub: dive shops, restaurants, motorbike hire and songthaews are all within walking distance. Most of the island's accommodation is clustered around Mae Haad (beach and village), Sairee Beach (north of the pier, a short walk or songthaew ride) and the quieter bays further south and east. If your guesthouse is in a remote bay, arrange a pickup in advance or take a longtail from Mae Haad pier.
October to December: rough-seas caution
The Gulf of Thailand monsoon affects Koh Tao more severely than it affects Samui or Phangan, partly because Tao is further north and more exposed. October, November and December can bring genuinely rough seas, and fast catamarans can cancel sailings with short notice. Songserm in particular has a history of reducing or suspending their Koh Tao service during the worst weeks. Key points to bear in mind:
- Cancellations are more likely in November than in October or December. Plan for a possible extra night on the mainland if you are travelling during this period.
- The overnight slow boat is not advisable in rough conditions — exposed deck, long crossing, and high chance of seasickness.
- If you are already on Koh Tao and need to leave in bad weather, consider flying out via Koh Samui's airport — you can get to Samui by inter-island catamaran (on good-weather days) and then fly, or take a helicopter if desperate. See ferries to the Thai islands for a broader picture of how monsoon seasons affect each Gulf island.
- Travel insurance that covers weather cancellations and accommodation rebooking is especially sensible for this route.
Weather window, October–December: Ferry operators may cancel Koh Tao services with little notice during rough seas. Check forecasts, book flexible accommodation, and allow buffer days in your schedule if you are travelling in this period.
Island hopping: coming from or going to Koh Phangan
Koh Tao is connected directly to Koh Phangan by the same Lomprayah and Songserm catamarans, with the crossing to Phangan's Thong Sala pier taking around 1–1.5 hours. You do not need to return to the mainland. The Koh Phangan to Koh Tao guide covers that inter-island hop in detail. If you are doing all three Gulf islands in sequence, the logical order is Samui → Phangan → Tao (or the reverse), with catamarans connecting each leg.
Frequently asked questions
How long does the catamaran from Donsak take to reach Koh Tao?
Lomprayah takes around 3 hours from Donsak to Mae Haad, calling at Koh Samui and Koh Phangan en route. Songserm's direct service takes approximately 2 hours 30 minutes. Times vary depending on sea conditions and the number of island stops.
Is the overnight slow boat from Surat Thani safe?
It is an established service and runs year-round in normal conditions, but it is a basic vessel with open decks and no cabins. It is not advisable in rough weather, particularly October to December. In calm conditions it is a perfectly reasonable budget option — just bring a mat, a layer and low expectations of comfort.
Should I book my Koh Tao ferry in advance?
Yes, especially for Lomprayah, which has limited catamaran capacity. In high season (January–September) the morning departure can fill up. Booking online a day or two ahead is wise; in the weeks around Christmas and New Year, book further in advance.
Can I get to Koh Tao from Bangkok without flying?
Yes. The overnight train from Bangkok to Phunphin, followed by a transfer to Donsak and a morning catamaran, is a popular route. You leave Bangkok in the evening and arrive on Koh Tao the following afternoon. Combined bus-boat tickets also exist for those who prefer coach to train. See Thailand by train for the Bangkok–Surat Thani rail leg.
Sources and further reading:
- Lomprayah High Speed Catamaran (lomprayah.com) — timetables, combined tickets, Mae Haad arrivals.
- Songserm Express Boat (songserm-expressboat.com) — Donsak–Koh Tao schedule.
- Thai Meteorological Department (tmd.go.th) — Gulf of Thailand weather and monsoon data.
- State Railway of Thailand (railway.co.th) — overnight train from Bangkok to Phunphin.