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

Return flights

26 Aug - 28 Aug	ANA
30 Aug - 06 Sep	ANA
30 Aug - 02 Sep	ANA
29 Aug - 31 Aug	ANA
28 Aug - 31 Aug	ANA
27 Aug - 28 Aug	ANA
28 Aug - 01 Sep	ANA
26 Aug - 02 Sep	ANA
27 Aug - 29 Aug	ANA
31 Aug - 08 Sep	ANA
31 Aug - 07 Sep	ANA
30 Aug - 01 Sep	Japan Airlines
26 Aug - 26 Aug	Japan Airlines
29 Aug - 01 Sep	Japan Airlines
30 Aug - 13 Sep	ANA
30 Aug - 03 Sep	ANA

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 $318

Return flights