Osaka (KIX) to Seoul (SEL): 535 miles (860 km) great-circle, about 1h 35m nonstop by our estimate. Cheapest fare observed: $142 round-trip on Jeju Air, nonstop, departing July 5, 2026.
$142 round-trip, Jeju Air 7C1392, departing 2026-07-05 at 10:50, returning 2026-07-14. The recorded itinerary left on a Sunday, returning on a Tuesday 9 nights later; the fare was observed 71 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $142, it ranked 6th of the 30 round-trip fares we recorded from KIX (median $608). That is 26.6 cents per great-circle mile (round-trip price over one-way distance), close to the KIX median of 24.3 cents across 30 round-trip routes.
Routes from KIX of similar length: Vladivostok (642 mi) at $707 and Sapporo (673 mi) at $86.
Jeju Air had the cheapest fare on 2 of 30 KIX routes. It is the 28th longest of the 30 routes we track from KIX.
Of 24 departure airports with a fare to Seoul, Osaka (KIX) ranked 1st at $142. 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/Tokyo, Asia/Seoul; flight time is our estimate.