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

Return flights

30 Dec - 11 Jan	easyJet
05 Dec - 09 Dec	easyJet
04 Dec - 11 Dec	easyJet
12 Dec - 09 Jan	Lufthansa
06 Dec - 14 Dec	easyJet
09 Dec - 20 Dec	easyJet
13 Dec - 07 Jan	easyJet
13 Dec - 06 Jan	easyJet
13 Dec - 05 Jan	easyJet
29 Dec - 11 Jan	easyJet
07 Dec - 14 Dec	easyJet
13 Dec - 04 Jan	easyJet
22 Dec - 06 Jan	Wizz Air Malta
18 Dec - 05 Jan	easyJet
16 Dec - 30 Dec	easyJet
11 Dec - 23 Dec	easyJet
14 Dec - 04 Jan	Wizz Air
24 Dec - 31 Dec	easyJet
19 Dec - 27 Dec	Wizz Air Malta

Also check the deals for one-way flights from Keflavik to Madrid 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 Keflavik to Madrid in December from 180€

Return flights