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

Return flights

19 Aug - 09 Sep	United
18 Aug - 18 Sep	United	direct
18 Aug - 13 Sep	United	direct
19 Aug - 13 Sep	United	direct
17 Aug - 06 Sep	United	direct
20 Aug - 13 Sep	United	direct
22 Aug - 05 Sep	United	direct
21 Aug - 05 Sep	United	direct
22 Aug - 13 Sep	United	direct
16 Aug - 06 Sep	United	direct
19 Aug - 22 Aug	Vueling Airlines
19 Aug - 26 Aug	Vueling Airlines
23 Aug - 30 Aug	Iberia For Level	direct
20 Aug - 27 Aug	TAP
21 Aug - 27 Aug	TAP
16 Aug - 23 Aug	TAP
17 Aug - 24 Aug	SWISS
22 Aug - 26 Aug	Scandinavian Airlines
19 Aug - 26 Aug	Iberia For Level	direct
18 Aug - 20 Aug	Frontier Airlines

Also check the deals for one-way flights from San Francisco 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 San Francisco to Barcelona in August from 400€

Return flights