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

One-Way flights

29 Aug	Jeju Air	direct
07 Aug	Jeju Air	direct
05 Aug	Jeju Air	direct
04 Aug	Jeju Air	direct
20 Aug	Jeju Air	direct
10 Aug	Jeju Air	direct
09 Aug	Jeju Air	direct
27 Aug	Jeju Air	direct
19 Aug	Jeju Air	direct
31 Aug	Jeju Air	direct

Also check the deals for return 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 one-way flights from Seoul to Osaka in August from 35€

One-Way flights