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

Return flights

30 Sep - 07 Oct	Turkish Airlines
12 Sep - 19 Sep	MIAT Mongolian Airlines
13 Sep - 17 Sep	Air China
11 Sep - 18 Sep	Air China
18 Sep - 24 Sep	Air China
16 Sep - 19 Sep	Air China
15 Sep - 19 Sep	Air China
11 Sep - 15 Sep	Air China
11 Sep - 17 Sep	Air China
15 Sep - 23 Sep	Air China
18 Sep - 23 Sep	Air China
17 Sep - 16 Oct	Air China
16 Sep - 14 Oct	Air China
16 Sep - 15 Oct	Air China
18 Sep - 17 Oct	Air China
02 Sep - 24 Oct	Air China
04 Sep - 24 Oct	Air China
05 Sep - 24 Oct	Air China
15 Sep - 15 Oct	Air China
17 Sep - 20 Oct	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 330€

Return flights