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

Return flights

23 Sep - 20 Oct	Lufthansa
16 Sep - 23 Sep	Lufthansa
16 Sep - 25 Sep	Lufthansa
12 Sep - 16 Sep	KLM
09 Sep - 13 Sep	KLM
09 Sep - 16 Sep	Lufthansa
12 Sep - 14 Sep	KLM
08 Sep - 15 Sep	KLM
11 Sep - 15 Sep	KLM
12 Sep - 22 Sep	KLM
12 Sep - 26 Sep	KLM
17 Sep - 01 Oct	Singapore Airlines
17 Sep - 06 Oct	Singapore Airlines
17 Sep - 01 Oct	Finnair	direct
27 Sep - 04 Oct	Lufthansa
30 Sep - 10 Oct	Philippine Airlines
17 Sep - 07 Oct	Air France
25 Sep - 07 Oct	Lufthansa
17 Sep - 06 Oct	Finnair	direct
27 Sep - 04 Oct	Finnair	direct

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 $573

Return flights