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

Return flights

26 Sep - 04 Oct	Wizz Air Malta
23 Sep - 07 Oct	Ryanair
23 Sep - 04 Oct	Ryanair
26 Sep - 09 Oct	Ryanair
23 Sep - 27 Sep	Ryanair
18 Sep - 25 Sep	Ryanair
17 Sep - 30 Sep	Fly Play
30 Sep - 06 Oct	Ryanair
17 Sep - 25 Sep	Fly Play
25 Sep - 06 Oct	Norwegian Air Sweden AOC
24 Sep - 08 Oct	Wizz Air Malta
20 Sep - 01 Oct	easyJet
20 Sep - 27 Sep	Vueling Airlines
20 Sep - 29 Sep	Vueling Airlines
27 Sep - 29 Sep	Vueling Airlines
25 Sep - 29 Sep	Vueling Airlines
22 Sep - 27 Sep	Vueling Airlines
23 Sep - 28 Sep	Ryanair
29 Sep - 09 Oct	Wizz Air Malta
27 Sep - 02 Oct	easyJet

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

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

Cheapest return flights from Barcelona to Keflavik in September from 221€

Return flights