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

Return flights

27 Aug - 03 Sep	Fly Play
31 Aug - 10 Sep	Fly Play
29 Aug - 07 Sep	Vueling Airlines
27 Aug - 04 Sep	Fly Play
27 Aug - 07 Sep	Fly Play
27 Aug - 01 Sep	Fly Play
29 Aug - 04 Sep	Fly Play
28 Aug - 07 Sep	Vueling Airlines
26 Aug - 07 Sep	Air Europa
29 Aug - 01 Sep	Fly Play
27 Aug - 31 Aug	Fly Play
27 Aug - 30 Aug	Fly Play
25 Aug - 31 Aug	Fly Play
25 Aug - 30 Aug	Fly Play
27 Aug - 31 Aug	Fly Play	direct
26 Aug - 31 Aug	Air Europa
30 Aug - 31 Aug	Ryanair
26 Aug - 30 Aug	Air Europa
24 Aug - 27 Aug	Fly Play
25 Aug - 29 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 $292

Return flights