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

Return flights

22 Dec - 30 Dec	Scandinavian Airlines
01 Dec - 07 Dec	Finnair
12 Dec - 16 Dec	Finnair
05 Dec - 14 Dec	Finnair
01 Dec - 11 Dec	Finnair
09 Dec - 16 Dec	Finnair
01 Dec - 10 Dec	Finnair
08 Dec - 15 Dec	Finnair
07 Dec - 13 Dec	Finnair
30 Dec - 11 Jan	Finnair
12 Dec - 14 Dec	Finnair
29 Dec - 08 Jan	Scandinavian Airlines
29 Dec - 06 Jan	Scandinavian Airlines
22 Dec - 01 Jan	Scandinavian Airlines
29 Dec - 05 Jan	Finnair
29 Dec - 09 Jan	Finnair
23 Dec - 06 Jan	Finnair
29 Dec - 07 Jan	Finnair
22 Dec - 04 Jan	LOT
25 Dec - 04 Jan	China Eastern

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 555€

Return flights