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

Return flights

16 Sep - 14 Oct	Ryanair
30 Sep - 21 Oct	Ryanair
30 Sep - 14 Oct	Ryanair
03 Sep - 29 Oct	Ryanair
20 Sep - 21 Oct	Ryanair
22 Sep - 14 Oct	Ryanair
20 Sep - 17 Oct	Ryanair
01 Sep - 16 Oct	Ryanair
02 Sep - 17 Sep	China Southern
02 Sep - 10 Sep	China Southern
09 Sep - 17 Sep	China Southern
28 Sep - 15 Oct	T'way Air	direct
29 Sep - 14 Oct	T'way Air	direct
09 Sep - 22 Sep	China Southern
02 Sep - 08 Sep	China Southern
04 Sep - 10 Sep	China Southern
02 Sep - 22 Sep	China Southern
04 Sep - 17 Sep	China Southern
02 Sep - 15 Sep	China Southern
11 Sep - 17 Sep	China Southern

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 $571

Return flights