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

Return flights

18 Sep - 24 Sep	Air France
15 Sep - 30 Sep	Scandinavian Airlines
17 Sep - 25 Sep	Scandinavian Airlines
18 Sep - 25 Sep	Air France
24 Sep - 01 Oct	KLM
13 Sep - 16 Sep	Scandinavian Airlines
19 Sep - 23 Sep	Scandinavian Airlines
15 Sep - 19 Sep	Scandinavian Airlines
19 Sep - 19 Oct	Scandinavian Airlines
10 Sep - 16 Sep	Lufthansa
23 Sep - 30 Sep	KLM
18 Sep - 23 Sep	Air France
25 Sep - 05 Oct	KLM
29 Sep - 03 Oct	KLM
29 Sep - 04 Oct	KLM
26 Sep - 02 Oct	KLM
26 Sep - 05 Oct	KLM
30 Sep - 04 Oct	Etihad Airways
02 Sep - 01 Oct	Air France
23 Sep - 07 Oct	KLM

Also check the deals for one-way flights from Seoul to Helsinki 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 Helsinki in September from $693

Return flights