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

Return flights

07 Dec - 10 Dec	easyJet
08 Dec - 16 Dec	easyJet
17 Dec - 06 Jan	Wizz Air
08 Dec - 11 Dec	Ryanair
03 Dec - 29 Jan	Ryanair
07 Dec - 16 Dec	easyJet
30 Dec - 08 Jan	Wizz Air
06 Dec - 13 Dec	Ryanair
08 Dec - 13 Dec	easyJet
02 Dec - 05 Dec	Ryanair
03 Dec - 10 Dec	easyJet
08 Dec - 15 Dec	Ryanair
22 Dec - 06 Jan	Ryanair
30 Dec - 06 Jan	Wizz Air
12 Dec - 16 Dec	Wizz Air Malta
23 Dec - 06 Jan	Ryanair
20 Dec - 06 Jan	Ryanair
23 Dec - 09 Jan	Ryanair
30 Dec - 07 Jan	Wizz Air
30 Dec - 04 Jan	Wizz Air

Also check the deals for one-way flights from Madrid 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 Madrid to Keflavik in December from 181€

Return flights