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

Return flights

02 Dec - 09 Dec	Lufthansa
03 Dec - 09 Dec	Air France
03 Dec - 08 Dec	Air France
03 Dec - 10 Dec	Air France
03 Dec - 11 Dec	Air France
01 Dec - 10 Dec	Lufthansa
01 Dec - 11 Dec	Lufthansa
06 Dec - 13 Dec	KLM
07 Dec - 14 Dec	KLM
25 Dec - 30 Dec	Lufthansa
30 Dec - 16 Jan	Air France
19 Dec - 09 Jan	Lufthansa
19 Dec - 12 Jan	Lufthansa
30 Dec - 06 Jan	Air France
19 Dec - 01 Jan	Lufthansa
22 Dec - 07 Jan	Lufthansa
30 Dec - 10 Jan	Air France
31 Dec - 10 Jan	Air France
29 Dec - 09 Jan	Air France
24 Dec - 02 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 507€

Return flights