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

Return flights

17 Sep - 19 Sep	Fly Play	direct
03 Sep - 05 Sep	Fly Play	direct
24 Sep - 29 Sep	Fly Play	direct
16 Sep - 24 Sep	easyJet
13 Sep - 24 Sep	easyJet
24 Sep - 01 Oct	Fly Play	direct
02 Sep - 10 Sep	easyJet
17 Sep - 24 Sep	Wizz Air Malta
01 Sep - 11 Sep	Wizz Air Malta
06 Sep - 10 Sep	easyJet
30 Sep - 03 Oct	easyJet
01 Sep - 05 Sep	Fly Play	direct
24 Sep - 03 Oct	Fly Play	direct
23 Sep - 02 Oct	easyJet
29 Sep - 03 Oct	Vueling Airlines
29 Sep - 06 Oct	Vueling Airlines
29 Sep - 10 Oct	Vueling Airlines
27 Sep - 01 Oct	Vueling Airlines
26 Sep - 03 Oct	Fly Play	direct
26 Sep - 08 Oct	Fly Play	direct

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 $185

Return flights