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

Return flights

19 Aug - 27 Aug	Delta
19 Aug - 28 Aug	British Airways
19 Aug - 02 Sep	British Airways
17 Aug - 26 Aug	KLM
13 Aug - 22 Aug	Delta
04 Aug - 19 Aug	Delta
11 Aug - 20 Aug	Delta
06 Aug - 20 Aug	Delta
04 Aug - 22 Aug	Air Canada
17 Aug - 25 Aug	Air France
18 Aug - 25 Aug	Iberia
14 Aug - 08 Sep	Air France
14 Aug - 06 Sep	Air France
14 Aug - 07 Sep	Delta
23 Aug - 27 Sep	Delta
26 Aug - 02 Sep	British Airways
31 Aug - 07 Sep	United
29 Aug - 02 Sep	Delta
28 Aug - 14 Sep	Delta
28 Aug - 04 Sep	United

Also check the deals for one-way flights from Washington to Madrid 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 Madrid in August from 333€

Return flights