AirHint found the following cheapest return flights from Frankfurt (FRA) to Seoul (ICN) in September 2026 (see full year).

Return flights

21 Sep - 05 Oct	Air China
23 Sep - 16 Oct	Air China
07 Sep - 19 Oct	Air China
01 Sep - 19 Oct	Air China
19 Sep - 09 Oct	Air China
21 Sep - 10 Oct	Air China
12 Sep - 10 Oct	Air China
21 Sep - 07 Oct	Air China
20 Sep - 18 Oct	Air China
22 Sep - 09 Oct	Air China
13 Sep - 27 Sep	MIAT Mongolian Airlines
07 Sep - 21 Sep	LOT
12 Sep - 26 Sep	MIAT Mongolian Airlines
19 Sep - 26 Sep	MIAT Mongolian Airlines
01 Sep - 15 Sep	Finnair
01 Sep - 14 Sep	LOT
02 Sep - 16 Sep	Finnair
07 Sep - 16 Sep	Finnair
04 Sep - 23 Sep	LOT
04 Sep - 25 Sep	MIAT Mongolian Airlines

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 $672

Return flights