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
11 May - 19 May	Transavia France
02 May - 09 May	Wizz Air UK
30 May - 09 Jun	Iberia
12 May - 17 May	Wizz Air UK
12 May - 20 May	Wizz Air UK
09 May - 16 May	Wizz Air UK
19 May - 26 May	Ryanair
18 May - 26 May	Wizz Air Malta
05 May - 12 May	Iberia
19 May - 30 May	Ryanair
30 May - 07 Jun	Iberia
23 May - 02 Jun	Norwegian
26 May - 07 Jun	Wizz Air Malta
28 May - 07 Jun	Norwegian
25 May - 03 Jun	Iberia
26 May - 06 Jun	Wizz Air Malta
25 May - 04 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 $226

Return flights