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

Return flights

01 Dec - 07 Dec	Scandinavian Airlines
01 Dec - 09 Dec	Scandinavian Airlines
26 Dec - 30 Dec	Scandinavian Airlines
07 Dec - 15 Dec	LOT
04 Dec - 09 Dec	Finnair
26 Dec - 04 Jan	Scandinavian Airlines
26 Dec - 06 Jan	Scandinavian Airlines
08 Dec - 15 Dec	Finnair
06 Dec - 13 Dec	Finnair
12 Dec - 20 Dec	Scandinavian Airlines
07 Dec - 13 Dec	Finnair
07 Dec - 20 Dec	Finnair
25 Dec - 03 Jan	Asiana Airlines
24 Dec - 08 Jan	Scandinavian Airlines
24 Dec - 01 Jan	Scandinavian Airlines
25 Dec - 01 Jan	Emirates
24 Dec - 04 Jan	Finnair
24 Dec - 02 Jan	Finnair
22 Dec - 02 Jan	Finnair
25 Dec - 02 Jan	Emirates

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 742€

Return flights