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

Return flights

29 Dec - 10 Jan	Air France
29 Dec - 08 Jan	Air France
30 Dec - 07 Jan	Air France
30 Dec - 06 Jan	Air France
28 Dec - 06 Jan	KLM
31 Dec - 11 Jan	KLM
23 Dec - 14 Jan	KLM
31 Dec - 07 Jan	Air France
22 Dec - 07 Jan	Air France
23 Dec - 06 Jan	KLM
22 Dec - 26 Dec	Air France
23 Dec - 29 Dec	KLM
23 Dec - 28 Dec	KLM
22 Dec - 31 Dec	Air France
24 Dec - 29 Dec	KLM
23 Dec - 31 Dec	KLM
22 Dec - 27 Dec	Air France
24 Dec - 31 Dec	Air France
27 Dec - 31 Dec	KLM
23 Dec - 27 Dec	KLM

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 499€

Return flights