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

Return flights

04 Dec - 09 Dec	Lufthansa
18 Dec - 09 Jan	Lufthansa
09 Dec - 14 Dec	KLM
08 Dec - 12 Dec	Air France
01 Dec - 10 Dec	Air France
04 Dec - 14 Dec	Air France
01 Dec - 08 Dec	Air France
06 Dec - 11 Dec	KLM
11 Dec - 16 Dec	Lufthansa
17 Dec - 24 Dec	Lufthansa
25 Dec - 30 Dec	Lufthansa
25 Dec - 04 Jan	Lufthansa
21 Dec - 06 Jan	Lufthansa
29 Dec - 08 Jan	Scandinavian Airlines
26 Dec - 01 Jan	Lufthansa
25 Dec - 03 Jan	Lufthansa
24 Dec - 01 Jan	Lufthansa
26 Dec - 02 Jan	Lufthansa
27 Dec - 01 Jan	KLM
26 Dec - 03 Jan	Lufthansa

Also check the deals for one-way flights from Seoul to Helsinki 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 Seoul to Helsinki in December from $577

Return flights