AirHint found the following cheapest return flights from Seoul (GMP) to Osaka (KIX) in August 2026 (see full year).

Return flights

23 Aug - 28 Aug	Korean Air	direct
28 Aug - 09 Sep	Korean Air	direct
03 Aug - 07 Aug	Korean Air	direct
05 Aug - 06 Aug	Korean Air	direct
07 Aug - 14 Aug	Korean Air	direct
07 Aug - 15 Aug	Korean Air	direct
07 Aug - 13 Aug	Korean Air	direct
08 Aug - 14 Aug	Korean Air	direct
01 Aug - 02 Aug	Korean Air	direct
22 Aug - 23 Aug	Korean Air	direct
19 Aug - 23 Aug	Korean Air	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 $256

Return flights