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

Return flights

19 Aug - 03 Sep	Air Canada
19 Aug - 25 Aug	Air Canada
18 Aug - 25 Aug	Air Canada
12 Aug - 22 Aug	SWISS
05 Aug - 20 Aug	Air Canada
11 Aug - 20 Aug	Air Canada
25 Aug - 02 Sep	Air Canada
21 Aug - 28 Aug	TAP
03 Aug - 08 Sep	KLM
24 Aug - 02 Sep	Air Canada
11 Aug - 24 Aug	TAP
13 Aug - 20 Aug	TAP
03 Aug - 20 Aug	Lufthansa
23 Aug - 02 Sep	TAP
21 Aug - 01 Sep	TAP
03 Aug - 19 Aug	TAP
19 Aug - 03 Sep	American Airlines	direct
03 Aug - 08 Sep	United	direct
23 Aug - 27 Sep	Air France
22 Aug - 01 Sep	TAP

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 $366

Return flights