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A Koh Samui day charter on a credible 55ft to 75ft yacht runs THB 55,000 to THB 140,000 per day (about USD 1,500 to USD 3,900) all-in for a 9-hour day with 6 to 8 guests, shoulder season as of April 2026. The market is smaller than Phuket, with roughly 25 credible day-yacht options across the Bophut, Maenam, and Chaweng-side fleets. The smaller fleet has one practical advantage that the brokers do not advertise: the Angthong Marine Park is materially less crowded than Phang Nga Bay, and you can have an inner lagoon at Koh Mae Ko effectively to yourselves on a Tuesday in May.
The Koh Samui market exists because the Gulf of Thailand season is the inverse of the Andaman season. When Phuket is monsoonal (June to October), Samui is generally workable. When Samui is monsoonal (late October to December), Phuket is into peak. The two markets together cover the Thai charter calendar.
Two booking facts to anchor decisions.
First, the embarkation point matters less here than in Phuket because Samui is smaller. Most operators depart from Bophut Beach or the small jetty at Maenam. There is no central marina; tenders come to the beach. This catches first-time charter clients who expect a dock. Wear the sandals you can wade in.
Second, the credible day routes are short. Angthong is the only must-visit. Koh Phangan is 30 minutes north. Koh Tao is 90 minutes further on a fast yacht. A full day reaches Angthong plus Koh Phangan or Angthong plus a swim stop. Trying to add Koh Tao to a single day cuts the time at each stop to nothing.
The embarkation points
Bophut Beach. The primary charter base. Most credible operators run a beach tender to and from anchored yachts. The walk-from-hotel logistics are easier than Maenam. Most Samui hotels north of Chaweng can taxi to Bophut in 15 to 25 minutes.
Maenam. Slightly quieter alternative. Some operators based in Maenam are owner-operators with one or two yachts. Beach tender embarkation. Cheaper taxi from Bophut hotels than the airport route.
Chaweng Beach. The high-volume tourist beach. Most operators here run the speedboat day-trip market, not the private yacht market. We do not route private charter clients through Chaweng.
Lipa Noi (west coast). Quieter departure. A handful of catamaran operators based here. Useful if your hotel is on the west coast. Cruising radius is the same.
The five operators we route to
These are operators we have either chartered, brokered, or whose fleet condition we have inspected within the last 12 months.
Princess Yachts Samui. Mid-size fleet including a 65ft Princess and a 75ft Princess, both Bophut-based. The most consistent product on Samui. Dispatch is reliable. Pricing 10 to 15% above the median.
Samui Yacht Charters. Smaller operator with a 62ft motor yacht and a 48ft Lagoon catamaran. The catamaran is the better pick for a family of 8. Bophut-based.
Boat Lagoon Yachting (Samui division). The Samui arm of the Phuket-based brokerage. Rotating fleet from charter-active sales inventory. Quality varies yacht to yacht. Specify the yacht in writing.
Island Cruises. Owner-operator with one Lagoon 620 catamaran. Strong catering side. Worth checking availability for a 10-person group day.
Sail in Asia (Samui). Sailing yacht charters and catamarans, including a Beneteau Oceanis and a Lagoon 50. The sailing-yacht option matters here because the Gulf of Thailand has more reliable sailing wind than the Andaman during March to August.
Passed on
Three categories we route charter clients away from:
Shared speedboat operators marketed as "private yacht day". The most common Samui trick: a marketplace lists a "private day boat" at THB 18,000, then the operator runs the same speedboat as a shared with two other groups. Always require "exclusive use" in writing.
Older traditional Thai junks at premium private-yacht rates. Beautiful for a 2-hour sunset photo session. Uncomfortable for a 9-hour day in 33-degree heat with limited shade and modest head facilities. Book as a sunset, not a full day.
Operators that quote without the Angthong Marine Park entrance fees itemised. Park fees are real (see below). If they are not on the quote, they will be on the invoice. Get itemisation in writing.
Specific yacht passes for 2026. The 58ft "Vista" charter that markets at Chaweng has had reported air-conditioning failures during the April hot season.. Until evidence of overhaul, route to the Bophut catamarans instead.
Angthong Marine Park fees
Angthong (Mu Ko Angthong National Park) entrance fee as of April 2026: THB 300 per foreign adult, THB 150 per Thai resident, plus a yacht entry fee tied to LOA (typically THB 800 to THB 1,500 for a 50ft to 80ft yacht). Most operators include the park fee in the quote. Some itemise. The park is open year-round but is closed for swimming inside the inner Mae Ko lagoon when sea state is poor.
The inner emerald lagoon at Koh Mae Ko (Talay Nai) is the photo stop. Access is by a 1km uphill walking path from the beach. Decent shoes matter; the path is uneven.
The credible day routes from Bophut
The Angthong loop (9 hours). Depart Bophut 09:00. Run 90 minutes to Koh Wua Ta Lap (the park HQ island) for the viewpoint hike (1 hour). Lunch at anchor. Afternoon at Koh Mae Ko for the inner emerald lagoon (90 minutes). Swim stop at Koh Sam Sao or Koh Hin Dap. Return to Bophut 18:00. This is the canonical Samui day.
Angthong plus Koh Phangan east coast (9 hours). Same morning at Angthong, return via Koh Phangan's east-coast bays (Haad Yuan, Bottle Beach) for a 90-minute swim stop. Good combination day. Avoid Haad Rin and the south coast on full-moon proximity days.
The Koh Phangan loop (8 hours). For repeat charter clients who have already done Angthong. Depart 09:30. Run east to the Phangan bays. Stops at Haad Yuan, Bottle Beach, and Koh Ma off the northwest tip for snorkelling. Lunch at anchor. Return 17:30. This is the quieter alternative.
Koh Tao day (10 hours, fast yacht only). Possible on a yacht running 25+ knots. Depart 08:00, run 2 hours to Koh Tao, snorkel at Shark Bay or Mango Bay, lunch, return. The day is mostly transit. We rarely recommend it. Treat Koh Tao as an overnight charter instead.
Weather and the booking calendar
The Gulf of Thailand has a distinct seasonal pattern.
January to April. Peak season. Flat conditions, daytime temperatures 28 to 33 degrees. Book 2 to 4 weeks out for weekends. Christmas-to-New Year carries over from the late high season and needs 6 to 10 weeks lead time.
May to September. Workable. Afternoon squalls possible. Sea state moderate on the east-facing beaches. Book 5 to 14 days out.
Late October to December. The northeast monsoon. Sea state often rough. Day charters cancel materially. This is the time of year to be in Phuket instead.
The 2026 specific note: 2025 closed with a stronger-than-typical late-November front that knocked out 8 consecutive days of charter on Samui's east coast. The 2026 forecast suggests a return to the standard monsoon pattern. Book outside the late October to mid-December window for predictable weather.
What the rate buys
A credible Samui day charter quote should include: fuel for the stated route, captain and crew, soft drinks and water, basic snacks, swim and snorkel equipment, marine park entry fees (or itemised), and standard insurance. It should not include: alcohol (BYO or paid bar), upgraded catering (THB 1,500 to THB 3,500 per person), or jet ski rental (THB 4,500 to THB 7,000 per hour per ski).
Gratuity convention: 10% of charter fee, paid in cash to the captain at end of day.
How Samui compares
Koh Samui sits below Phuket on fleet size and recency, above Phuket on park-crowding pressure (which is a feature, not a bug, for a charter client). Day rates are roughly 15 to 25% below comparable Phuket yachts. The bigger gap is in product variety: where Phuket has the 80ft+ tier across multiple operators, Samui's top end is a smaller pool. If the day is principally about a quiet stop at the inner emerald lagoon, Samui is the better call. If the day is principally about a polished 80ft yacht with full catering, Phuket has more options.
For weekly charter from a Samui base the picture is thin. Most operators that run weekly charters position the yacht to the Andaman for high season. The right Samui product is the day. The right Thailand weekly is the Andaman 10-day from Phuket.
The other lever is the hotel. Bophut hotels favour Bophut-based operators by 15 to 25 minutes of transit time. The Bophut and Choeng Mon hotels worth booking tend to coordinate yacht-day bookings directly with their concierge desk, which can move the needle on availability inside 48 hours.
FAQ
When is the Koh Samui charter season?
The dependable season runs January to mid-September. The Gulf of Thailand monsoon hits late October to December, which is the inverse of Phuket's pattern.
Can a day charter reach Angthong Marine Park?
Yes. Angthong is 20 to 25 nautical miles northwest of Bophut. A credible 55ft+ yacht reaches the park in 90 minutes, leaving 5 to 6 hours inside the park. The inner lagoon at Koh Mae Ko requires the tide window for the walking path access.
Are Koh Samui and Phuket comparable as day-charter bases?
No. Phuket has a larger and more recent fleet. Koh Samui has fewer yachts but materially less marine-park crowding. The seasons are inverted, so Samui is the right pick October through December when Phuket is monsoonal.
Where do Samui day charters board from?
Most operators run a beach tender from Bophut, Maenam, or Lipa Noi. There is no central marina. Wear sandals you can wade in for embarkation.
What is the gratuity convention on Samui?
10% of the charter fee, paid in cash to the captain in Thai baht or USD.
Is alcohol permitted aboard?
Yes. Most operators run BYO with no corkage. Some offer a paid bar service. Confirm at booking.