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

Return flights

23 Sep - 30 Sep	Air France
22 Sep - 30 Sep	KLM
22 Sep - 25 Sep	Scandinavian Airlines
24 Sep - 01 Oct	T'way Air
22 Sep - 29 Sep	T'way Air
22 Sep - 01 Oct	KLM
26 Sep - 01 Oct	Air France
25 Sep - 06 Oct	T'way Air
26 Sep - 05 Oct	Air France
24 Sep - 06 Oct	T'way Air
21 Sep - 28 Sep	T'way Air
26 Sep - 04 Oct	Air France
27 Sep - 29 Sep	Air France
27 Sep - 05 Oct	Air France
23 Sep - 26 Sep	Air France
25 Sep - 28 Sep	Air France
27 Sep - 04 Oct	Air France
23 Sep - 30 Sep	Finnair	direct
26 Sep - 03 Oct	Air France
22 Sep - 26 Sep	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 $904

Return flights