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

Return flights

18 Aug - 27 Aug	British Airways
13 Aug - 18 Aug	British Airways
11 Aug - 18 Aug	British Airways
16 Aug - 26 Aug	Air Canada
31 Aug - 09 Sep	Air Canada
31 Aug - 11 Sep	Air Canada
20 Aug - 29 Aug	Finnair
10 Aug - 16 Aug	British Airways
10 Aug - 17 Aug	British Airways
19 Aug - 30 Aug	Air Canada
10 Aug - 19 Aug	Delta
17 Aug - 24 Aug	United
28 Aug - 01 Sep	jetBlue
29 Aug - 08 Sep	Air Canada
28 Aug - 02 Sep	Delta
28 Aug - 06 Sep	Delta
29 Aug - 01 Sep	Delta
30 Aug - 07 Sep	Iberia
27 Aug - 01 Sep	British Airways

Also check the deals for one-way flights from Washington 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 Washington to Barcelona in August from 410€

Return flights