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

Return flights

25 Sep - 29 Sep	ANA
17 Sep - 19 Sep	ANA
17 Sep - 20 Sep	ANA
21 Sep - 29 Sep	ANA
20 Sep - 24 Sep	ANA
18 Sep - 25 Sep	ANA
12 Sep - 17 Sep	ANA
13 Sep - 16 Sep	ANA
20 Sep - 22 Sep	ANA
20 Sep - 29 Sep	ANA
30 Sep - 04 Oct	ANA
27 Sep - 04 Oct	ANA
30 Sep - 03 Oct	Ibex Airlines
28 Sep - 02 Oct	Japan Airlines
29 Sep - 06 Oct	Japan Airlines
29 Sep - 01 Oct	Japan Airlines
24 Sep - 01 Oct	Japan Airlines
23 Sep - 08 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.

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Cheapest return flights from Osaka to Seoul in September from $361

Return flights