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

Return flights

27 Sep - 09 Oct	Ryanair
18 Sep - 24 Sep	KLM
26 Sep - 03 Oct	Fly Play	direct
30 Sep - 09 Oct	easyJet
26 Sep - 08 Oct	Fly Play
12 Sep - 24 Sep	Ryanair
06 Sep - 06 Oct	Vueling Airlines
30 Sep - 11 Oct	easyJet
27 Sep - 07 Oct	Ryanair
12 Sep - 22 Sep	Ryanair
26 Sep - 01 Oct	Ryanair
26 Sep - 06 Oct	Ryanair
26 Sep - 05 Oct	Fly Play
09 Sep - 18 Sep	Wizz Air
11 Sep - 18 Sep	KLM
06 Sep - 17 Sep	easyJet
13 Sep - 28 Sep	Vueling Airlines
17 Sep - 24 Sep	Fly Play
24 Sep - 29 Sep	Ryanair
16 Sep - 21 Sep	Wizz Air Malta

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 $204

Return flights