Cheapest flights from South Korea to Japan

Flights between South Korea and Japan are among the busiest corridors in East Asia. Competition on trunk routes (Seoul–Tokyo, Seoul–Osaka) is strong, but the cheapest itinerary is not always from the airport closest to your home. Low-cost carriers, seasonal charters, and connecting options can shift the best deal to Incheon, Gimpo, or even Busan depending on your final city in Japan.

Start by separating two questions: which Korean airport is cheapest for your dates, and which Japanese airport is the right entry point. Fares to Fukuoka or Osaka sometimes undercut Tokyo when your trip includes western Japan, even if you eventually take a domestic train.

Why comparison matters

Published fares vary by departure point because airlines optimize for local demand, slot access, and partner connections. A traveler in Daegu might assume Seoul is always cheaper, but Jeju or Busan can occasionally offer better positioning for specific carriers or promo periods.

FareScope is built to make that airport-level comparison explicit: pick South Korea as your departure country, enter a Japanese city as your destination, and review how major hubs rank before you open a partner site to book.

Before you book

Treat any side-by-side estimate as a planning aid. Taxes, baggage, and seat fees change the total. Always confirm the final price on the airline or OTA checkout page. FareScope does not sell tickets — we link outward to partners where bookings are completed.

Check flight options with our travel partners after you narrow airports. Bookings complete on third-party sites only — see our Terms.