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

Return flights

29 Jul - 05 Aug	Air Canada
30 Jul - 06 Aug	KLM
29 Jul - 06 Aug	United
28 Jul - 08 Aug	SWISS
20 Jul - 05 Aug	Iberia For Level	direct
29 Jul - 05 Aug	Iberia For Level	direct
31 Jul - 05 Aug	Iberia For Level	direct
27 Jul - 11 Aug	Lufthansa
22 Jul - 29 Jul	Air Canada
14 Jul - 24 Jul	United
13 Jul - 21 Jul	SWISS
13 Jul - 22 Jul	SWISS
14 Jul - 22 Jul	Lufthansa
31 Jul - 11 Aug	Air Canada
22 Jul - 30 Jul	British Airways
16 Jul - 30 Jul	British Airways
16 Jul - 30 Jul	Iberia	direct
12 Jul - 23 Jul	Delta	direct
29 Jul - 06 Aug	Delta	direct
12 Jul - 20 Jul	Air Canada

Also check the deals for one-way flights from Boston to Barcelona in July.

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 July from 343€

Return flights