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

Return flights

10 Sep - 22 Oct	Air China
18 Sep - 14 Oct	Air China
24 Sep - 16 Oct	Air China
24 Sep - 12 Oct	Air China
23 Sep - 12 Oct	Air China
18 Sep - 12 Oct	Air China
19 Sep - 12 Oct	Air China
22 Sep - 12 Oct	Air China
03 Sep - 31 Oct	Air China
12 Sep - 15 Sep	Ryanair
17 Sep - 20 Oct	Air China
11 Sep - 18 Sep	Air China
04 Sep - 18 Sep	Air China
01 Sep - 23 Sep	Air China
10 Sep - 18 Sep	Air China
08 Sep - 17 Sep	Air China
12 Sep - 19 Sep	Ryanair
02 Sep - 18 Sep	Air China
09 Sep - 16 Sep	Ryanair
01 Sep - 07 Sep	Ryanair

Also check the deals for one-way flights from Frankfurt to Seoul 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 Frankfurt to Seoul in September from $665

Return flights