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

Return flights

04 Dec - 09 Dec	Wizz Air
05 Dec - 07 Dec	Ryanair
03 Dec - 09 Dec	Wizz Air
04 Dec - 08 Dec	Wizz Air
07 Dec - 11 Dec	Wizz Air
06 Dec - 09 Dec	easyJet
08 Dec - 11 Dec	Wizz Air
03 Dec - 06 Dec	Wizz Air
03 Dec - 08 Dec	Wizz Air
06 Dec - 12 Dec	SWISS
18 Dec - 11 Jan	Ryanair
04 Dec - 05 Jan	Wizz Air
22 Dec - 01 Jan	Scandinavian Airlines
18 Dec - 01 Jan	Ryanair
14 Dec - 05 Jan	Wizz Air
16 Dec - 05 Jan	Ryanair
22 Dec - 05 Jan	Wizz Air
29 Dec - 12 Jan	Scandinavian Airlines
29 Dec - 13 Jan	Scandinavian Airlines
18 Dec - 08 Jan	easyJet

Also check the deals for one-way flights from Copenhagen 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 Copenhagen to Keflavik in December from $197

Return flights