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

Return flights

08 Dec - 09 Dec	easyJet
01 Dec - 09 Dec	easyJet
11 Dec - 15 Dec	Wizz Air Malta
11 Dec - 16 Dec	Wizz Air Malta
03 Dec - 09 Dec	easyJet
02 Dec - 09 Dec	Air Europa
10 Dec - 11 Dec	easyJet
10 Dec - 16 Dec	Wizz Air Malta
10 Dec - 13 Dec	easyJet
07 Dec - 11 Dec	easyJet
31 Dec - 06 Jan	easyJet
17 Dec - 01 Jan	Wizz Air Malta
22 Dec - 06 Jan	easyJet
05 Dec - 12 Jan	Wizz Air
24 Dec - 07 Jan	Wizz Air
23 Dec - 06 Jan	Wizz Air Malta
30 Dec - 10 Jan	Wizz Air
24 Dec - 03 Jan	Wizz Air
30 Dec - 09 Jan	Wizz Air
30 Dec - 06 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 146€

Return flights