Cheapest return LIS–KEF flights, May

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

Return flights

20 May - 25 May Ryanair
19 May - 25 May Ryanair
20 May - 09 Jun Ryanair
21 May - 27 May Ryanair
21 May - 26 May Ryanair
20 May - 10 Jun Ryanair
21 May - 25 May Ryanair
21 May - 24 May Ryanair
22 May - 01 Jun Ryanair
21 May - 28 May Ryanair
24 May - 28 May Vueling Airlines
28 May - 07 Jun Ryanair
21 May - 31 May Ryanair
21 May - 11 Jun Ryanair
29 May - 08 Jun Vueling Airlines
21 May - 10 Jun Ryanair
25 May - 14 Jun Ryanair
26 May - 28 May easyJet
31 May - 04 Jun Ryanair
31 May - 04 Jun Icelandair direct

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

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