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

One-Way flights

02 Dec	Royal Brunei
05 Dec	T'way Air
03 Dec	T'way Air
21 Dec	Etihad Airways
31 Dec	T'way Air
20 Dec	MIAT Mongolian Airlines
26 Dec	T'way Air
10 Dec	Etihad Airways
22 Dec	Etihad Airways
19 Dec	T'way Air

Also check the deals for return 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 one-way flights from Seoul to Helsinki in December from 325€

One-Way flights