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

Return flights

07 Dec - 09 Dec	Ryanair
31 Dec - 07 Jan	easyJet
03 Dec - 09 Dec	easyJet
04 Dec - 09 Dec	Ryanair
09 Dec - 16 Dec	easyJet
06 Dec - 09 Dec	Ryanair
15 Dec - 30 Dec	Wizz Air Malta
13 Dec - 16 Dec	easyJet
07 Dec - 15 Dec	Wizz Air Malta
07 Dec - 16 Dec	easyJet
02 Dec - 09 Dec	Air Europa
24 Dec - 01 Jan	LOT
15 Dec - 05 Jan	KLM
31 Dec - 06 Jan	easyJet
30 Dec - 08 Jan	Iberia
21 Dec - 10 Jan	Wizz Air
30 Dec - 07 Jan	Ryanair
30 Dec - 06 Jan	Iberia
31 Dec - 05 Jan	easyJet
29 Dec - 07 Jan	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.

Book a cheap hotel in Keflavik

Cheap car rent in Keflavik

Cheapest return flights from Madrid to Keflavik in December from 165€

Return flights