Cheapest return MAD–KEF flights, May

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

Return flights

27 May - 02 Jun Wizz Air
27 May - 05 Jun Wizz Air
28 May - 07 Jun Iberia Express
28 May - 04 Jun Iberia Express
26 May - 02 Jun Ryanair
28 May - 01 Jun Ryanair
28 May - 02 Jun Ryanair
31 May - 02 Jun Wizz Air Malta
26 May - 29 May Ryanair
25 May - 28 May Wizz Air
31 May - 07 Jun Wizz Air Malta
26 May - 09 Jun Ryanair
21 May - 24 May Ryanair
25 May - 31 May Wizz Air
26 May - 31 May Ryanair
21 May - 26 May Ryanair
23 May - 26 May Wizz Air
22 May - 26 May Wizz Air
21 May - 30 May Iberia Express
21 May - 28 May Ryanair

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

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