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

Return flights

22 Sep - 26 Sep	Fly Play
03 Sep - 13 Sep	easyJet
17 Sep - 24 Sep	Fly Play
03 Sep - 10 Sep	Wizz Air
29 Sep - 03 Oct	Fly Play
25 Sep - 29 Sep	easyJet
03 Sep - 19 Sep	Fly Play
10 Sep - 19 Sep	Fly Play
05 Sep - 12 Sep	Fly Play
17 Sep - 24 Sep	Fly Play	direct
24 Sep - 29 Sep	easyJet
22 Sep - 01 Oct	Fly Play
22 Sep - 01 Oct	Fly Play	direct
27 Sep - 01 Oct	Wizz Air
29 Sep - 06 Oct	easyJet
29 Sep - 03 Oct	Fly Play	direct
29 Sep - 06 Oct	Fly Play	direct

Also check the deals for one-way flights from Keflavik to Barcelona 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 Keflavik to Barcelona in September from 199€

Return flights