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Ask what a yacht costs in Phuket and you get a number that means nothing until you know what it is attached to. Half the island quotes per person, the other half quotes per boat, and the gap between those two habits is where most of the confusion about private charters lives.
Here is how the money actually works.
Per boat, not per seat
A private charter in Thailand is priced for the whole boat. You are not buying a chair on a vessel with forty strangers, you are buying the vessel. That one difference reorders everything else: the itinerary, the departure time, the lunch, whether the music plays or the children sleep on the way home.
The opening numbers for a full day in low season, by boat type, look like this. A speedboat starts at ฿33,900 — an AQVA 37, seven hours, six guests in the rate. A sailing catamaran starts at ฿34,900 for a Fountaine Pajot 40, eight hours with fifteen guests in the rate. A motor yacht starts at ฿39,900 for an Ocean Pearl 42, eight hours, ten guests. A power catamaran starts at ฿48,900. At the other end, a 130 ft Westport runs ฿750,000 for a day to Phi Phi, and a Sunreef 60 sits at ฿571,800. Motor yachts are the largest category on the island at thirty-eight boats, which is why that is where the price spread is widest.
The absolute cheapest way onto the water is not a yacht at all — it is a long-tail out of Chalong, four hours in the morning with four guests included.
Where the arithmetic flips
Divide, and the picture changes. Ella, a 53 ft sailing catamaran licensed for forty guests, costs from ฿27,820 for the whole boat with ten guests in the rate. Fill it properly — forty adults, low season, a morning half-day — and the total comes to ฿53,500. That is about ฿1,340 a head.
A seat on a group speedboat to Phi Phi is usually quoted between ฿1,500 and ฿2,500 before park fees. So a full catamaran undercuts the group tour, and you get the boat to yourselves.
Two caveats before anyone books on that arithmetic alone. The boat must be licensed for the number you are dividing by — licensing is enforced here and a captain will refuse to leave the pier over it. And most yachts add a per-guest charge above the headcount included in the rate, so the honest comparison is the final total for your group, not the “from” price. Current yacht charter prices in Phuket are published per boat with those supplements in the table, which is the only way to compare two quotes without building a spreadsheet.
The flip point, roughly: below six people, group tours win on money. Between six and twelve it is a draw, and the private boat wins on everything that is not money. Above twelve, the private boat is usually cheaper outright.
What is not in the headline
Three things get added after the quote, and they are the same three for everyone.
National park fees. Charged per person, per park, collected on the day. Phi Phi, Phang Nga and the Similans each have their own rate. No operator can waive them.
Food. Most boats quote meals separately — around ฿500 a head for a proper meal on board is normal, not an upsell. Some crews will stop at a beach restaurant instead if you prefer.
Range. A day inside the usual radius is covered; ask for somewhere far and the extra engine hours appear on the bill. This is why distance matters more than it looks. Phi Phi is 48 km from Phuket — an easy run on a speedboat, and a committed day on a sailing catamaran doing seven knots.
Three piers, three different days
Where the boat sleeps decides where your day can go.
Ao Po Grand Marina, on the northeast coast, opens onto Phang Nga Bay — the limestone islands, the lagoons, Koh Hong. Flat water almost all year.
Chalong Pier, in the south, is the shortest run to Coral Island, Racha and Phi Phi. Busier, more working boats, earlier starts.
Boat Lagoon, on the east coast, is tide-dependent — the channel is shallow and your departure time is set by the water, not by you.
If a quote looks cheaper than the rest, check the pier before you celebrate. A boat leaving from the wrong side of the island can spend two hours of your charter getting to where you wanted to start.
The season moves everything
Low season runs May to October and carries those starting rates. High season is November to April. Peak dates around Christmas and New Year are set by each yacht separately — some start in mid-December, others in January — and they are charged at the peak rate, with no extra holiday surcharge stacked on top.
The spread between low and peak on the same boat is substantial. If your dates are flexible, the week either side of the holiday block is the best value sailing of the year: the northeast monsoon is already in, the water is flat, and the boats are not yet full. Those dates also go first, so “flexible” has a deadline.
When the group tour still wins
A private boat is not automatically the right answer, and it is worth saying so.
If you are two people, take the group tour. If you want to see four islands in one day, take the speedboat tour — private charters stop at two or three and take their time. If you want a guide narrating the geology, group operators do that and most private crews do not. And if the weather looks marginal, a group tour that cancels and refunds is a smaller exposure than a charter deposit.
What you pay extra for on a private boat is control: your departure time, your anchorage, your lunch, and no stranger’s music. For a family or a group of friends that is usually worth the difference. For a couple on a budget, honestly, it is not.
Work out your total for your actual headcount, on your actual dates, from your actual pier. That number is comparable. The “from” price on anyone’s website is not.