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

Return flights

12 Dec - 16 Dec	Wizz Air Malta
12 Dec - 15 Dec	Fly Play	direct
01 Dec - 05 Dec	easyJet
06 Dec - 09 Dec	easyJet
05 Dec - 09 Dec	easyJet
12 Dec - 19 Dec	Fly Play	direct
12 Dec - 17 Dec	Wizz Air Malta
08 Dec - 15 Dec	Fly Play	direct
01 Dec - 05 Dec	Fly Play	direct
12 Dec - 14 Dec	Wizz Air Malta
06 Dec - 26 Jan	easyJet
21 Dec - 06 Jan	Ryanair
26 Dec - 09 Jan	easyJet
20 Dec - 04 Jan	Ryanair
28 Dec - 01 Jan	easyJet
26 Dec - 09 Jan	Fly Play	direct
22 Dec - 02 Jan	Fly Play	direct
25 Dec - 01 Jan	British Airways
27 Dec - 10 Jan	Iberia
24 Dec - 03 Jan	easyJet

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 125€

Return flights