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

Return flights

31 Aug - 29 Sep	KLM
28 Aug - 01 Sep	KLM
31 Aug - 10 Sep	KLM
28 Aug - 08 Sep	KLM
27 Aug - 10 Sep	Fly Play
28 Aug - 02 Sep	Wizz Air Malta
27 Aug - 11 Sep	Fly Play
29 Aug - 08 Sep	Fly Play
28 Aug - 31 Aug	KLM
28 Aug - 03 Sep	KLM
25 Aug - 01 Sep	KLM
23 Aug - 27 Aug	Iberia
29 Aug - 31 Aug	Vueling Airlines
27 Aug - 31 Aug	Fly Play
22 Aug - 27 Aug	Air Europa
23 Aug - 29 Aug	Iberia
23 Aug - 28 Aug	Iberia
25 Aug - 31 Aug	KLM
20 Aug - 27 Aug	Ryanair
24 Aug - 27 Aug	Fly Play

Also check the deals for one-way flights from Barcelona to Keflavik in August.

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 August from 224€

Return flights