Cheapest return flights from Lisbon to Keflavik in September from $234

Best time to book flights for Lisbon (LIS) to Keflavik (KEF) flights at AirHint

AirHint found the following cheapest return flights from Lisbon (LIS) to Keflavik (KEF) in September 2025 (see full year).

Return flights

16 Sep - 21 Sep easyJet
05 Sep - 15 Sep Fly Play direct
05 Sep - 08 Sep Fly Play direct
02 Sep - 07 Sep easyJet
16 Sep - 22 Sep easyJet
12 Sep - 15 Sep Vueling Airlines
17 Sep - 21 Sep Ryanair
01 Sep - 05 Sep Fly Play direct
02 Sep - 09 Sep easyJet
26 Sep - 29 Sep Vueling Airlines
28 Sep - 01 Oct easyJet
27 Sep - 05 Oct easyJet
28 Sep - 19 Oct Scandinavian Airlines
28 Sep - 06 Oct easyJet
29 Sep - 06 Oct Fly Play direct
28 Sep - 19 Oct Icelandair direct
28 Sep - 18 Oct Ryanair
29 Sep - 19 Oct Scandinavian Airlines
29 Sep - 02 Oct Vueling Airlines

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

Skyscanner

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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