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

Return flights

25 Sep - 28 Sep	T'way Air
29 Sep - 12 Oct	Eastar Jet
23 Sep - 20 Oct	ANA
25 Sep - 02 Oct	Peach
29 Sep - 15 Oct	Japan Airlines
29 Sep - 04 Oct	Japan Airlines
29 Sep - 13 Oct	T'way Air
22 Sep - 23 Sep	ANA
22 Sep - 14 Oct	ANA
28 Sep - 05 Oct	Japan Airlines
30 Sep - 21 Oct	ANA
28 Sep - 30 Sep	Japan Airlines
23 Sep - 02 Oct	ANA
27 Sep - 28 Sep	ANA
25 Sep - 30 Sep	ANA
24 Sep - 30 Sep	ANA
24 Sep - 25 Sep	Korean Air
25 Sep - 27 Sep	Air China

Also check the deals for one-way flights from Seoul to Frankfurt 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 Frankfurt in September from 828€

Return flights