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

Return flights

15 Dec - 22 Dec	Fly Play	direct
12 Dec - 22 Dec	Fly Play	direct
01 Dec - 05 Dec	Fly Play	direct
08 Dec - 15 Dec	Fly Play	direct
19 Dec - 22 Dec	Fly Play	direct
12 Dec - 19 Dec	Fly Play	direct
15 Dec - 19 Dec	Fly Play	direct
11 Dec - 17 Dec	Iberia
06 Dec - 11 Dec	Wizz Air Malta
05 Dec - 12 Dec	easyJet
29 Dec - 09 Jan	Fly Play	direct
19 Dec - 01 Jan	Wizz Air Malta
29 Dec - 02 Jan	Iberia Express
29 Dec - 05 Jan	Fly Play	direct
25 Dec - 02 Jan	Iberia Express
29 Dec - 02 Jan	Fly Play	direct
27 Dec - 02 Jan	Iberia Express

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 261CAD

Return flights