Singapore (SIN) to Seoul (SEL): 2,875 miles (4,627 km) great-circle, about 6h 15m nonstop by our estimate. Cheapest fare observed: $405 round-trip on Hainan Airlines, with 1 stop, departing April 30, 2026.
$405 round-trip, Hainan Airlines HU748, departing 2026-04-30 at 12:05, returning 2026-05-03. The recorded itinerary left on a Thursday, returning on a Sunday 3 nights later; the fare was observed 5 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $405, it ranked 20th of the 30 round-trip fares we recorded from SIN (median $361). That is 14.1 cents per great-circle mile (round-trip price over one-way distance), below the SIN median of 19.9 cents across 30 round-trip routes.
Routes from SIN of similar length: Beijing (2,790 mi) at $219 and Tokyo (3,293 mi) at $391.
SIN to SEL is the only one of 30 SIN routes where Hainan Airlines priced cheapest. It is the 11th longest of the 30 routes we track from SIN.
Of 24 departure airports with a fare to Seoul, Singapore (SIN) ranked 17th at $405. Lowest: $142 from Osaka (KIX); highest: $1288 from Portland (PDX); 10 nonstop. Cheapest-fare airlines (routes): Jetstar (2), Peach Aviation (2), airline 9G (1), airline WE (1), Alaska Airlines (1) and Asiana (1), plus 16 more.
That depends on your passport and trip, so check the official source for South Korea: Republic of Korea: K-ETA. Connecting elsewhere? Check that country's transit rules too.
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones Asia/Singapore, Asia/Seoul; flight time is our estimate.