Singapore (SIN) to Koh Samui (USM): 628 miles (1,010 km) great-circle, about 1h 45m nonstop by our estimate. Cheapest fare observed: $369 round-trip on Scoot, nonstop, departing April 28, 2026.
$369 round-trip, Scoot TR640, departing 2026-04-28 at 07:00, returning 2026-05-09. The recorded itinerary left on a Tuesday, returning on a Saturday 11 nights later; the fare was observed 3 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $369, it ranked 16th of the 30 round-trip fares we recorded from SIN (median $361). That is 58.8 cents per great-circle mile (round-trip price over one-way distance), above the SIN median of 19.9 cents across 30 round-trip routes.
Routes from SIN of similar length: Phuket (609 mi) at $182 and Ho Chi Minh City (679 mi) at $238.
Scoot had the cheapest fare on 4 of 30 SIN routes. It is the 26th longest of the 30 routes we track from SIN.
Of 5 departure airports with a fare to Koh Samui, Singapore (SIN) ranked 4th at $369. Lowest: $171 from Phuket (HKT); highest: $413 from Bali (DPS); 4 nonstop. Cheapest-fare airlines (routes): Bangkok Airways (3), AirAsia (1) and Scoot (1).
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones Asia/Singapore, Asia/Bangkok; flight time is our estimate.