Seoul (ICN) to Jeju City (CJU): 273 miles (440 km) great-circle, about 1h 05m nonstop by our estimate. Cheapest fare observed: $78 round-trip on Jeju Air, nonstop, departing July 13, 2026.
$78 round-trip, Jeju Air 7C167, departing 2026-07-13 at 18:05, returning 2026-07-17. The recorded itinerary left on a Monday, returning on a Friday 4 nights later; the fare was observed 79 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $78, it was the cheapest of the 30 round-trip fares we recorded from ICN (median $393). That is 28.5 cents per great-circle mile (round-trip price over one-way distance), above the ICN median of 21.3 cents across 30 round-trip routes.
Routes from ICN of similar length: Busan (210 mi) at $232 and Vladivostok (507 mi) at $434.
Jeju Air had the cheapest fare on 5 of 30 ICN routes. It is the 29th longest of the 30 routes we track from ICN.
Of 2 departure airports with a fare to Jeju City, Seoul (ICN) ranked 1st at $78. Lowest: $78 from Seoul (ICN); highest: $345 from Taipei (TPE); 1 nonstop. Cheapest-fare airlines (routes): Jeju Air (2).
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones Asia/Seoul, Asia/Seoul; flight time is our estimate.