Seoul (ICN) to Bangkok (BKK): 2,280 miles (3,669 km) great-circle, about 5h 05m nonstop by our estimate. Cheapest fare observed: $250 round-trip on Shandong Airlines, with 1 stop, departing May 18, 2026.
$250 round-trip, Shandong Airlines SC8004, departing 2026-05-18 at 23:40, returning 2026-05-27. The recorded itinerary left on a Monday, returning on a Wednesday 9 nights later; the fare was observed 23 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $250, it ranked 11th of the 30 round-trip fares we recorded from ICN (median $393). That is 11.0 cents per great-circle mile (round-trip price over one-way distance), below the ICN median of 21.3 cents across 30 round-trip routes.
Routes from ICN of similar length: Novosibirsk (2,366 mi) at $889 and Nha Trang (2,057 mi) at $198.
Shandong Airlines had the cheapest fare on 3 of 30 ICN routes. It is the 15th longest of the 30 routes we track from ICN.
Of 59 departure airports with a fare to Bangkok, Seoul (ICN) ranked 11th at $250. Lowest: $73 from Phuket (HKT); highest: $1428 from Mexico City (MEX); 14 nonstop. Cheapest-fare airlines (routes): Air India (5), Etihad (5), Thai Vietjet Air (4), Air China (3), Scoot (3) and Thai AirAsia (3), plus 31 more.
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones Asia/Seoul, Asia/Bangkok; flight time is our estimate.