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

Return flights

04 Dec - 15 Dec	Scandinavian Airlines
11 Dec - 24 Dec	Scandinavian Airlines
04 Dec - 09 Dec	Turkish Airlines
04 Dec - 09 Dec	Finnair	direct
04 Dec - 15 Dec	Finnair	direct
11 Dec - 08 Jan	Finnair	direct
07 Dec - 21 Dec	Finnair	direct
11 Dec - 24 Dec	Finnair	direct
10 Dec - 06 Jan	Finnair	direct
18 Dec - 08 Jan	Finnair	direct
22 Dec - 28 Dec	Finnair	direct
21 Dec - 04 Jan	Finnair	direct
20 Dec - 05 Jan	Finnair	direct
22 Dec - 12 Jan	Finnair

Also check the deals for one-way flights from Helsinki to Seoul in December.

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 December from $688

Return flights