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
11 Dec - 16 Dec	Lufthansa
02 Dec - 12 Dec	KLM
04 Dec - 14 Dec	Air France
05 Dec - 12 Dec	Air France
01 Dec - 11 Dec	Air France
18 Dec - 09 Jan	Lufthansa
02 Dec - 10 Dec	KLM
03 Dec - 12 Dec	Air France
01 Dec - 10 Dec	Air France
03 Dec - 10 Dec	Air France
23 Dec - 05 Jan	Lufthansa
28 Dec - 04 Jan	KLM
26 Dec - 05 Jan	Lufthansa
18 Dec - 01 Jan	Lufthansa
27 Dec - 04 Jan	KLM
22 Dec - 05 Jan	Lufthansa
22 Dec - 06 Jan	Lufthansa
25 Dec - 02 Jan	Lufthansa
22 Dec - 07 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 500€

Return flights