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

Return flights

03 Dec - 07 Dec	easyJet
01 Dec - 03 Dec	easyJet
07 Dec - 09 Dec	easyJet
05 Dec - 09 Dec	easyJet
01 Dec - 07 Dec	easyJet
07 Dec - 13 Dec	easyJet
03 Dec - 11 Dec	easyJet
03 Dec - 10 Dec	easyJet
01 Dec - 06 Dec	easyJet
08 Dec - 13 Dec	easyJet
31 Dec - 05 Jan	KLM
15 Dec - 02 Jan	Fly Play	direct
21 Dec - 05 Jan	easyJet
27 Dec - 08 Jan	Scandinavian Airlines
29 Dec - 12 Jan	Fly Play	direct
22 Dec - 04 Jan	easyJet
27 Dec - 10 Jan	Scandinavian Airlines
26 Dec - 09 Jan	Fly Play	direct
20 Dec - 04 Jan	easyJet
29 Dec - 05 Jan	Fly Play	direct

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 132€

Return flights