Day trips from Koh Phangan to Koh Tao and Samui: the timings

What a day trip to Koh Tao or Koh Samui actually looks like

Both islands are visible from Koh Phangan's coasts, which makes them feel closer than they are. Koh Tao is roughly an hour north by fast boat; Samui is half an hour south. Neither is far. The problem with both as day trips is not distance — it is the shape of the timetable, which decides how many usable hours you get on the other side.

Here is the arithmetic, honestly done, plus when it is worth doing at all.

Koh Tao: possible, but a short day

Boats leave from Thong Sala pier and arrive at Mae Haad on Koh Tao. The crossing generally takes between one hour and one hour 45 minutes, with tickets costing around 450 to 650 THB, and the route is run by Lomprayah, Songserm, Lomlahkkhirin and Seatran Discovery.

There are up to eight sailings a day, most vessels doing the crossing in around an hour, with the last departure from Thong Sala usually in the late afternoon.

The return leg is the constraint. Lomprayah runs three daily departures from Mae Haad back to Thong Sala, the first at 09:30 and the last at 16:30, with tickets from around 300 THB. So your day is bounded at roughly half past four, whatever you do.

That means the earliest boat out matters more than anything else. Take one of the early fast crossings and you have five or six hours ashore. Take the Songserm service, which leaves Koh Phangan at 10:00 and arrives at 12:00, and you have about four — enough for lunch, one swim and a taxi boat, not much more.

Timetables shift with the season and operators adjust them without much notice, so check the operator's own page for the week you are travelling rather than trusting a screenshot from a blog. Book the day before in January and February; the boats fill.

If you go, what fits in the day

Koh Tao is a diving island. A day trip skims it. You cannot start a course, and a two-dive morning plus the last boat home is a tight, slightly anxious plan. What does fit:

• Koh Nang Yuan. Taxi boats leave Mae Haad and Sairee, the crossing takes about 15 to 20 minutes, most boats run between 9 am and 4 pm, and there is a per-person fee paid on arrival — quoted at 100 THB — plus a ban on single-use plastic bottles, so bring a refillable one. Some travellers report being charged more than that, so carry cash and don't count on card. The hilltop viewpoint is a 10 to 15 minute climb up steep wooden steps and rock, and it is the view you have already seen on postcards. It is also busy in the middle of the day, which is exactly when a day-tripper arrives.
• Snorkelling and a long lunch at Sairee, then the boat home.

There is a second route to the same place: the speedboat snorkel tours that run from Koh Phangan with hotel pickup, calling at spots off Koh Tao and stopping on Nang Yuan for lunch. You trade independence for someone else handling the timings, and you spend the day with a group. If your reason for going is the water rather than the island, that is usually the better version.

Samui is an errand, not an outing

The Samui crossing is easy. Ferries run from Thong Sala to Bangrak Seatran Pier seven days a week, all year, taking about 30 to 45 minutes, with the first departure at 10:30 and the last at 17:30.

Other services run to Maenam Pier on Samui's north coast, 4 km west of Bophut.

But a 10:30 out and a 17:30 back leaves you five hours on an island where everything worth seeing is a taxi ride apart, and Samui taxis are the most expensive on the Gulf. As sightseeing, it does not repay the effort — Samui is bigger, busier and more built up than Koh Phangan, and you will spend the day in traffic.

Where the trip does make sense is practical. The large shopping centres, specialist doctors and dentists, a proper bookshop, particular imported groceries: those are real reasons to cross for a day, and the timetable suits them well.

Two further notes. Raja runs the vehicle ferry between Lipa Noi on Samui's west coast and Thong Sala in about 75 minutes, and it is the right ticket only if you are actually bringing a car or motorbike across — for a day out, rent on Koh Phangan instead. And if the plan is Bophut's Friday walking street, which runs from 5pm to 10pm with the street closed to traffic and no entry fee , accept that it is an overnight. The last boat home leaves before the market gets going.

Sea, season and small print

From late October into December the Gulf swells with the northeast monsoon, and crossings that are flat and dull in March become genuinely unpleasant. Services can be cut at short notice in that window. If you have a flight to catch afterwards, do not put an island-hopping day immediately before it.

Other things worth knowing:

• These are domestic crossings, but bring your passport anyway; some operators ask.
• Arrive at Thong Sala half an hour before departure. Parking near the pier is straightforward on a scooter, less so in a car.
• Prices quoted online often carry a small booking fee on top. Buying at a pier office or a Thong Sala agent is usually the same money or slightly less.
• The 4pm-ish return boats are the busy ones. Be in the queue early rather than watching it fill.

The honest verdict

If you have four or five days on Koh Phangan, spend them here. Both day trips cost you a full day and give back a few hours somewhere less interesting than where you started. If you have ten days or more, Koh Tao on an early boat is a good use of one of them, particularly if you want the clear water off Nang Yuan. Samui is worth crossing for when you need something the island cannot sell you.

From Villa Ullassa it is ten minutes down the hill to Thong Sala pier, which makes catching the first boat out considerably less painful than it is from the north or east coast. We can arrange the drive and, if you would rather not think about timetables at all, help you find the right boat for the day you have in mind.