AirHint found the following cheapest return flights from Madrid (MAD) to Keflavik (KEF) in May 2026 (see full year).

Return flights

12 May - 19 May	Wizz Air UK
30 May - 09 Jun	Norwegian
02 May - 06 May	Wizz Air UK
20 May - 30 May	Ryanair
08 May - 17 May	Scandinavian Airlines
13 May - 17 May	Wizz Air UK
12 May - 21 May	Wizz Air UK
30 May - 13 Jun	Norwegian
10 May - 15 May	LOT
06 May - 09 May	easyJet
23 May - 03 Jun	Wizz Air UK
27 May - 07 Jun	Scandinavian Airlines
16 May - 23 May	Iberia Express
09 May - 16 May	Wizz Air Malta
26 May - 06 Jun	Wizz Air Malta
27 May - 06 Jun	Transavia France
24 May - 03 Jun	Iberia

Also check the deals for one-way flights from Madrid to Keflavik in May.

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 May from 194€

Return flights