Cheapest return flights from Lisbon to Keflavik in September from 204€

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

23 Sep - 28 Sep easyJet
01 Sep - 08 Sep Fly Play direct
09 Sep - 17 Sep easyJet
29 Sep - 05 Oct easyJet
15 Sep - 22 Sep Fly Play direct
26 Sep - 06 Oct Vueling Airlines
23 Sep - 29 Sep easyJet
10 Sep - 16 Sep Ryanair
26 Sep - 06 Oct Fly Play direct
10 Sep - 21 Sep Ryanair
11 Sep - 21 Sep Ryanair
11 Sep - 22 Sep Ryanair
08 Sep - 22 Sep Fly Play direct
28 Sep - 05 Oct easyJet

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.

Book a cheap hotel in Keflavik

Cheap car rent in Keflavik