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

Return flights

09 May - 17 May	Iberia Express
12 May - 17 May	Wizz Air UK
13 May - 17 May	Iberia Express
19 May - 26 May	Wizz Air Malta
02 May - 13 May	easyJet
06 May - 17 May	easyJet
06 May - 13 May	easyJet
19 May - 23 May	Wizz Air UK
05 May - 12 May	Wizz Air UK
13 May - 23 May	easyJet
30 May - 09 Jun	Iberia
28 May - 07 Jun	Norwegian
30 May - 13 Jun	Iberia
26 May - 09 Jun	Wizz Air Malta
04 May - 02 Jun	Transavia France
29 May - 09 Jun	Transavia France
29 May - 05 Jun	Transavia France
31 May - 14 Jun	Iberia
26 May - 07 Jun	Wizz Air Malta
31 May - 13 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 $201

Return flights