Cheapest return flights from Keflavik to Lisbon in September from 226€

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

Return flights

23 Sep - 30 Sep Fly Play
22 Sep - 29 Sep Fly Play direct
07 Sep - 25 Sep Fly Play
14 Sep - 21 Sep Fly Play
11 Sep - 25 Sep easyJet
06 Sep - 24 Sep Fly Play
25 Sep - 02 Oct Fly Play
03 Sep - 10 Sep Fly Play
28 Sep - 05 Oct Fly Play
02 Sep - 09 Sep Wizz Air
07 Sep - 14 Sep Transavia France
18 Sep - 19 Sep Wizz Air
28 Sep - 05 Oct Icelandair direct
25 Sep - 02 Oct Icelandair direct

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