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

Return flights

23 Dec - 27 Dec	Finnair
23 Dec - 29 Dec	LOT
02 Dec - 11 Dec	Finnair
01 Dec - 07 Dec	Finnair
10 Dec - 14 Dec	Finnair
04 Dec - 07 Dec	Finnair
16 Dec - 28 Jan	Finnair
01 Dec - 05 Dec	Qatar Airways
17 Dec - 06 Jan	Qatar Airways
19 Dec - 26 Dec	Qatar Airways
24 Dec - 09 Jan	Finnair
15 Dec - 26 Dec	Qatar Airways
03 Dec - 06 Dec	Qatar Airways
28 Dec - 03 Jan	Finnair
24 Dec - 02 Jan	Finnair
29 Dec - 02 Jan	Finnair
26 Dec - 02 Jan	Finnair
25 Dec - 02 Jan	Finnair
20 Dec - 03 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 $1054

Return flights