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

Return flights

09 Sep - 23 Sep	KLM
02 Sep - 09 Sep	KLM
09 Sep - 23 Sep	Finnair	direct
02 Sep - 09 Sep	Finnair	direct
03 Sep - 17 Sep	Finnair	direct
03 Sep - 11 Sep	Finnair	direct
03 Sep - 11 Sep	Air France
05 Sep - 14 Sep	Air France
10 Sep - 17 Sep	Finnair	direct
21 Sep - 12 Oct	KLM
01 Sep - 14 Sep	Air France
21 Sep - 12 Oct	Finnair	direct
16 Sep - 07 Oct	Air France
16 Sep - 07 Oct	Finnair	direct
28 Sep - 05 Oct	Finnair	direct

Also check the deals for one-way flights from Helsinki 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 Helsinki to Seoul in September from $758

Return flights