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

Return flights

06 May - 13 May	easyJet
08 May - 13 May	easyJet
05 May - 17 May	Wizz Air UK
09 May - 17 May	Iberia Express
30 May - 07 Jun	Norwegian
16 May - 30 May	Wizz Air UK
06 May - 09 May	easyJet
31 May - 14 Jun	Iberia
19 May - 27 May	easyJet
12 May - 16 May	Wizz Air UK
30 May - 16 Jun	Norwegian
13 May - 21 May	Ryanair
30 May - 13 Jun	Norwegian
01 May - 12 May	Iberia
23 May - 06 Jun	Norwegian
30 May - 06 Jun	Norwegian
29 May - 07 Jun	Norwegian
22 May - 03 Jun	Iberia
29 May - 05 Jun	Norwegian
22 May - 29 Jun	Ryanair

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 172€

Return flights