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

Return flights

30 Aug - 09 Sep	TAP
20 Aug - 28 Aug	Iberia For Level	direct
18 Aug - 28 Aug	Iberia For Level	direct
20 Aug - 12 Sep	Iberia For Level	direct
30 Aug - 06 Sep	TAP
21 Aug - 11 Sep	Iberia
20 Aug - 27 Aug	Virgin Atlantic
21 Aug - 28 Aug	Iberia	direct
19 Aug - 26 Aug	Virgin Atlantic
29 Aug - 05 Sep	Icelandair
22 Aug - 29 Aug	Icelandair
19 Aug - 03 Sep	Iberia For Level	direct
25 Aug - 01 Sep	Air Canada
25 Aug - 02 Sep	Air Canada
22 Aug - 05 Sep	Iberia
18 Aug - 25 Aug	Air Canada
22 Aug - 12 Sep	Iberia
12 Aug - 20 Aug	United
10 Aug - 20 Aug	United
24 Aug - 31 Aug	Virgin Atlantic

Also check the deals for one-way flights from Boston 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 Boston to Barcelona in August from 297€

Return flights