AirHint found the following cheapest return flights from Osaka (ITM) to Seoul (ICN) in September 2025 (see full year).

Return flights

26 Sep - 28 Sep	ANA
19 Sep - 26 Sep	Ibex Airlines
25 Sep - 27 Sep	ANA
05 Sep - 07 Sep	ANA
16 Sep - 19 Sep	ANA
07 Sep - 11 Sep	ANA
09 Sep - 11 Sep	ANA
19 Sep - 21 Sep	ANA
07 Sep - 14 Sep	Japan Airlines
23 Sep - 26 Sep	ANA
22 Sep - 18 Oct	Japan Airlines
29 Sep - 01 Oct	ANA

Also check the deals for one-way flights from Osaka to Seoul in September.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

Book a cheap hotel in Seoul

Cheap car rent in Seoul

Cheapest return flights from Osaka to Seoul in September from $291

Return flights