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

Return flights

07 Dec - 14 Dec	Norwegian Air Sweden AOC
30 Dec - 16 Jan	Lufthansa
11 Dec - 01 Jan	KLM
01 Dec - 11 Dec	Finnair	direct
29 Dec - 13 Jan	Lufthansa
09 Dec - 01 Jan	Lufthansa
30 Dec - 16 Jan	Finnair	direct
29 Dec - 06 Jan	Finnair	direct
29 Dec - 10 Jan	Finnair	direct
18 Dec - 31 Dec	Finnair	direct
26 Dec - 09 Jan	Finnair	direct
29 Dec - 13 Jan	Finnair	direct
27 Dec - 10 Jan	Finnair	direct
17 Dec - 24 Dec	Finnair	direct
07 Dec - 14 Dec	Finnair	direct
04 Dec - 15 Dec	Finnair	direct
20 Dec - 27 Dec	Finnair	direct

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 592€

Return flights