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

Return flights

24 Aug - 14 Sep	Vueling Airlines	direct
31 Aug - 03 Sep	KLM
28 Aug - 31 Aug	Wizz Air
24 Aug - 31 Aug	Vueling Airlines	direct
30 Aug - 02 Sep	Wizz Air
24 Aug - 07 Sep	Vueling Airlines	direct
29 Aug - 01 Sep	SWISS
31 Aug - 14 Sep	Vueling Airlines	direct
29 Aug - 31 Aug	Wizz Air Malta
31 Aug - 07 Sep	Vueling Airlines	direct
31 Aug - 03 Sep	Fly Play	direct
29 Aug - 31 Aug	Fly Play	direct
29 Aug - 01 Sep	Fly Play	direct

Also check the deals for one-way flights from Keflavik to Barcelona 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 Keflavik to Barcelona in August from $363

Return flights