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

Return flights

25 Sep - 02 Oct	Vueling Airlines
25 Sep - 03 Oct	Vueling Airlines
23 Sep - 01 Oct	easyJet
23 Sep - 16 Oct	easyJet
29 Sep - 03 Oct	Vueling Airlines
13 Sep - 24 Sep	easyJet
20 Sep - 24 Sep	easyJet
23 Sep - 02 Oct	Ryanair
21 Sep - 01 Oct	Vueling Airlines
27 Sep - 03 Oct	Vueling Airlines
22 Sep - 03 Oct	Vueling Airlines
29 Sep - 02 Oct	Vueling Airlines
14 Sep - 24 Sep	Vueling Airlines
13 Sep - 25 Sep	Vueling Airlines
14 Sep - 18 Sep	Vueling Airlines
03 Sep - 09 Sep	Vueling Airlines
01 Sep - 10 Sep	Wizz Air Malta
19 Sep - 23 Sep	Ryanair
03 Sep - 08 Sep	Vueling Airlines
05 Sep - 07 Sep	Vueling Airlines

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.

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Cheapest return flights from Barcelona to Keflavik in September from 166€

Return flights