Data: Tokyo Narita – Seoul Incheon 20SEP26 Flight Schedule

Published at 1300PDT / 2000GMT 04SEP26

AeroRoutes on 02-03SEP26 published Korean Air and Asiana Airlines’ planned international service changes during Northern winter 2026/27 season. At the end of the post, AeroRoutes noted for the month of September 2026, Tokyo Narita – Seoul Incheon becomes the world’s busiest international route based on number of available seats filed in the OAG as of 30AUG26, with 554851 seats offered (round-trip).

Taipei Taoyuan – Hong Kong during the month of September 2026 slips to number 2 with 526357 seats.

The following schedule focuses on 20SEP26, which sees 42 round-trip flights a day between Tokyo Narita and Seoul Incheon, including Peach launching this route on the same day. On Tokyo Haneda – Seoul Gimpo route, there are 12 daily flights offered, while Tokyo Haneda – Seoul Incheon sees 3 daily flights.