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

Return flights

18 Dec - 28 Dec	Japan Airlines
20 Dec - 30 Dec	Japan Airlines
18 Dec - 01 Jan	Japan Airlines
11 Dec - 25 Dec	Japan Airlines
06 Dec - 13 Dec	Japan Airlines
18 Dec - 27 Dec	Japan Airlines
21 Dec - 30 Dec	Japan Airlines
12 Dec - 19 Dec	Japan Airlines
23 Dec - 29 Jan	Japan Airlines
21 Dec - 27 Dec	Japan Airlines
21 Dec - 02 Jan	Japan Airlines
28 Dec - 02 Jan	Japan Airlines

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 1135€

Return flights