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

Return flights

18 Aug - 25 Aug	British Airways
25 Aug - 05 Sep	British Airways
05 Aug - 21 Aug	British Airways
21 Aug - 25 Aug	British Airways
06 Aug - 20 Aug	British Airways
11 Aug - 20 Aug	British Airways
19 Aug - 26 Aug	United
05 Aug - 17 Aug	British Airways
10 Aug - 16 Aug	British Airways
16 Aug - 21 Aug	British Airways
29 Aug - 08 Sep	British Airways
20 Aug - 24 Aug	British Airways
29 Aug - 06 Sep	British Airways
25 Aug - 01 Sep	United
29 Aug - 07 Sep	Iberia
31 Aug - 07 Sep	United
28 Aug - 04 Sep	United

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 $480

Return flights