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

Return flights

22 Sep - 29 Oct	Ryanair
11 Sep - 14 Oct	China Southern
22 Sep - 15 Oct	Ryanair
15 Sep - 30 Oct	Ryanair
25 Sep - 30 Oct	China Southern
14 Sep - 29 Oct	Ryanair
22 Sep - 15 Oct	T'way Air	direct
09 Sep - 17 Sep	China Southern
11 Sep - 17 Sep	China Southern
18 Sep - 15 Oct	China Southern
28 Sep - 15 Oct	T'way Air	direct
28 Sep - 16 Oct	T'way Air	direct
09 Sep - 16 Sep	Air China
09 Sep - 22 Sep	Air China
08 Sep - 22 Sep	Air China
09 Sep - 15 Sep	Ryanair
06 Sep - 11 Sep	T'way Air	direct
07 Sep - 09 Sep	T'way Air	direct
06 Sep - 15 Sep	T'way Air	direct
10 Sep - 22 Sep	Air China

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 478€

Return flights