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

Return flights

17 Sep - 25 Sep	Wizz Air Malta
17 Sep - 23 Sep	Wizz Air Malta
18 Sep - 24 Sep	KLM
17 Sep - 24 Sep	KLM
17 Sep - 20 Sep	Wizz Air Malta
03 Sep - 08 Sep	KLM
15 Sep - 02 Oct	Vueling Airlines
17 Sep - 30 Sep	Wizz Air Malta
10 Sep - 25 Sep	Wizz Air Malta
30 Sep - 09 Oct	easyJet
18 Sep - 25 Sep	KLM
23 Sep - 02 Oct	Ryanair
27 Sep - 05 Oct	Vueling Airlines
20 Sep - 11 Oct	Vueling Airlines
19 Sep - 24 Sep	Ryanair
24 Sep - 03 Oct	Vueling Airlines
29 Sep - 09 Oct	Wizz Air Malta
27 Sep - 13 Oct	Vueling Airlines
27 Sep - 01 Oct	Ryanair
26 Sep - 05 Oct	Ryanair

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 158€

Return flights