Cheapest return flights from Lisbon to Keflavik in September from $210

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

24 Sep - 01 Oct Air Europa
16 Sep - 28 Sep easyJet
01 Sep - 08 Sep Fly Play direct
24 Sep - 28 Sep Ryanair
17 Sep - 24 Sep Ryanair
16 Sep - 23 Sep TAP
10 Sep - 17 Sep Vueling Airlines
02 Sep - 07 Sep easyJet
27 Sep - 04 Oct TAP
29 Sep - 06 Oct TAP
23 Sep - 30 Sep TAP
30 Sep - 07 Oct TAP
22 Sep - 29 Sep Fly Play direct
11 Sep - 15 Sep Ryanair
25 Sep - 02 Oct Ryanair
26 Sep - 03 Oct Air Europa
26 Sep - 02 Oct easyJet
28 Sep - 05 Oct Ryanair
25 Sep - 10 Oct Ryanair
28 Sep - 03 Oct Ryanair

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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