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

Return flights

31 Aug - 02 Sep	Peach	direct
30 Aug - 02 Sep	Peach	direct
31 Aug - 04 Sep	Jeju Air	direct
31 Aug - 10 Sep	Jeju Air	direct
30 Aug - 03 Sep	Jeju Air	direct
31 Aug - 01 Sep	Peach	direct
30 Aug - 01 Sep	Peach	direct
31 Aug - 06 Sep	Jeju Air	direct
31 Aug - 05 Sep	Jeju Air	direct
30 Aug - 16 Sep	Jeju Air	direct
30 Aug - 31 Aug	Peach	direct

Also check the deals for one-way flights from Seoul to Osaka 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 Seoul to Osaka in August from $132

Return flights