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

Return flights

24 Sep - 01 Oct	T'way Air
24 Sep - 03 Oct	T'way Air
24 Sep - 02 Oct	T'way Air
24 Sep - 05 Oct	T'way Air
25 Sep - 02 Oct	Eastar Jet
29 Sep - 01 Oct	Eastar Jet
30 Sep - 01 Oct	Jeju Air
23 Sep - 25 Sep	T'way Air
24 Sep - 04 Oct	T'way Air
28 Sep - 01 Oct	Jeju Air
29 Sep - 03 Oct	Jeju Air	direct
23 Sep - 26 Sep	T'way Air
22 Sep - 23 Sep	Jeju Air	direct
29 Sep - 30 Sep	Jeju Air	direct
27 Sep - 30 Sep	Jeju Air	direct
25 Sep - 29 Sep	Jin Air
23 Sep - 25 Sep	Jeju Air	direct
23 Sep - 26 Sep	Jeju Air	direct
23 Sep - 24 Sep	Jeju Air	direct
23 Sep - 30 Sep	Jeju Air	direct

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

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 September from 101€

Return flights