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

Return flights

30 Dec - 10 Jan	Wizz Air
22 Dec - 08 Jan	Air Europa
24 Dec - 30 Dec	Wizz Air
23 Dec - 30 Dec	Ryanair
24 Dec - 31 Dec	Wizz Air
31 Dec - 06 Jan	Wizz Air
30 Dec - 01 Jan	Wizz Air
28 Dec - 07 Jan	Ryanair
28 Dec - 31 Dec	Ryanair
28 Dec - 01 Jan	Wizz Air
28 Dec - 30 Dec	Ryanair
22 Dec - 30 Dec	Air Europa
25 Dec - 25 Jan	Iberia
30 Dec - 04 Jan	Ryanair
25 Dec - 30 Dec	Iberia
22 Dec - 26 Dec	Air Europa
25 Dec - 06 Jan	Iberia
28 Dec - 04 Jan	Ryanair
26 Dec - 31 Dec	Iberia
27 Dec - 31 Dec	Ryanair

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 253€

Return flights