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

Return flights

19 Aug - 26 Aug	Ibex Airlines
20 Aug - 23 Aug	ANA
29 Aug - 31 Aug	ANA
30 Aug - 31 Aug	ANA
10 Aug - 17 Aug	Ibex Airlines
19 Aug - 31 Aug	Japan Airlines
17 Aug - 19 Aug	ANA
13 Aug - 17 Aug	Japan Airlines
31 Aug - 02 Sep	ANA
09 Aug - 12 Aug	ANA
20 Aug - 27 Aug	Japan Airlines
04 Aug - 04 Sep	Japan Airlines
05 Aug - 04 Sep	Japan Airlines
02 Aug - 07 Sep	Japan Airlines
31 Aug - 03 Sep	Japan Airlines
21 Aug - 26 Sep	Japan Airlines
24 Aug - 20 Sep	Japan Airlines
14 Aug - 01 Sep	Japan Airlines

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

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 August from $272

Return flights