Cheapest return OPO–KEF flights, September

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

Return flights

26 Sep - 04 Oct easyJet
30 Sep - 12 Oct Ryanair
26 Sep - 29 Sep easyJet
28 Sep - 05 Oct Ryanair
18 Sep - 27 Sep Transavia France
30 Sep - 04 Oct easyJet
09 Sep - 15 Sep easyJet
25 Sep - 29 Sep SWISS
19 Sep - 28 Sep Transavia France
27 Sep - 29 Sep Ryanair
21 Sep - 24 Sep Ryanair
21 Sep - 27 Sep Transavia France
24 Sep - 29 Sep Scandinavian Airlines
21 Sep - 26 Sep Ryanair
30 Sep - 07 Oct KLM

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

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