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

Return flights

16 May - 24 May	easyJet
12 May - 17 May	Wizz Air UK
09 May - 17 May	Wizz Air UK
16 May - 26 May	Wizz Air UK
06 May - 10 May	Transavia France
19 May - 26 May	Wizz Air UK
12 May - 19 May	Wizz Air UK
08 May - 17 May	Iberia
12 May - 18 May	Wizz Air UK
09 May - 18 May	Wizz Air UK
30 May - 07 Jun	Iberia Express
28 May - 07 Jun	Norwegian
29 May - 05 Jun	Iberia
29 May - 08 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 181€

Return flights