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

13 May - 20 May Ryanair
12 May - 19 May Ryanair
19 May - 26 May Vueling Airlines
27 May - 04 Jun Ryanair
20 May - 27 May Ryanair
06 May - 13 May Ryanair
27 May - 07 Jun Ryanair
08 May - 11 May Ryanair
08 May - 10 May Ryanair
26 May - 02 Jun Ryanair
08 May - 15 May Ryanair
21 May - 25 May Ryanair
08 May - 13 May Ryanair
26 May - 11 Jun Ryanair
30 May - 01 Jun Vueling Airlines
28 May - 07 Jun Ryanair
29 May - 05 Jun Ryanair
27 May - 03 Jun Ryanair
31 May - 08 Jun Ryanair
25 May - 01 Jun easyJet

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

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