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

22 Sep - 29 Sep easyJet
12 Sep - 20 Sep easyJet
04 Sep - 13 Sep Transavia France
17 Sep - 27 Sep easyJet
30 Sep - 07 Oct easyJet
23 Sep - 30 Sep easyJet
29 Sep - 06 Oct easyJet
13 Sep - 20 Sep easyJet
15 Sep - 21 Sep easyJet
06 Sep - 13 Sep Ryanair
20 Sep - 27 Sep TAP
09 Sep - 19 Sep Ryanair
28 Sep - 05 Oct easyJet
26 Sep - 03 Oct Transavia France
27 Sep - 04 Oct easyJet
24 Sep - 01 Oct easyJet
25 Sep - 02 Oct TAP
29 Sep - 06 Oct Icelandair direct
30 Sep - 17 Oct Vueling Airlines
16 Sep - 03 Oct Vueling Airlines

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

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