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

Return flights

30 Dec - 13 Jan	Finnair
22 Dec - 30 Dec	Scandinavian Airlines
22 Dec - 31 Dec	Finnair
22 Dec - 28 Dec	Scandinavian Airlines
23 Dec - 28 Dec	Asiana Airlines
29 Dec - 06 Jan	Scandinavian Airlines
29 Dec - 08 Jan	Finnair
29 Dec - 14 Jan	Finnair
23 Dec - 31 Dec	Finnair
22 Dec - 01 Jan	Scandinavian Airlines
25 Dec - 31 Dec	Finnair
22 Dec - 29 Dec	Finnair
23 Dec - 27 Dec	Finnair
29 Dec - 31 Dec	Finnair
25 Dec - 03 Jan	Finnair
28 Dec - 03 Jan	Finnair
26 Dec - 30 Dec	LOT
29 Dec - 04 Jan	Scandinavian Airlines
25 Dec - 01 Jan	Finnair
27 Dec - 03 Jan	Finnair

Also check the deals for one-way flights from Seoul to Keflavik 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 Keflavik in December from 909€

Return flights