Cheapest return LIS–KEF flights, September

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

Return flights

23 Sep - 30 Sep easyJet
04 Sep - 13 Sep Vueling Airlines
17 Sep - 22 Sep easyJet
04 Sep - 14 Sep easyJet
09 Sep - 14 Sep easyJet
20 Sep - 01 Oct Ryanair
08 Sep - 14 Sep easyJet
17 Sep - 27 Sep easyJet
19 Sep - 30 Sep easyJet
02 Sep - 30 Sep TAP
05 Sep - 14 Sep easyJet
30 Sep - 07 Oct easyJet
24 Sep - 06 Oct Ryanair
03 Sep - 01 Oct Ryanair
24 Sep - 06 Oct Icelandair direct
03 Sep - 01 Oct Icelandair direct
30 Sep - 17 Oct Vueling Airlines
20 Sep - 01 Oct Icelandair direct
19 Sep - 07 Oct Vueling Airlines
23 Sep - 07 Oct Vueling Airlines

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

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