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

Return flights

20 Aug - 10 Sep	TAP
20 Aug - 10 Sep	American Airlines	direct
20 Aug - 27 Aug	TAP
20 Aug - 29 Aug	TAP
24 Aug - 02 Sep	TAP
25 Aug - 29 Aug	TAP
23 Aug - 27 Sep	Scandinavian Airlines
22 Aug - 26 Aug	TAP
22 Aug - 13 Sep	United
24 Aug - 06 Sep	SWISS
20 Aug - 27 Aug	American Airlines	direct
20 Aug - 29 Aug	American Airlines	direct
26 Aug - 02 Sep	Icelandair
31 Aug - 07 Sep	Air Canada
22 Aug - 27 Aug	TAP
21 Aug - 28 Aug	Finnair	direct
23 Aug - 27 Aug	TAP
17 Aug - 23 Aug	TAP
26 Aug - 06 Sep	ITA Airways
24 Aug - 06 Sep	American Airlines	direct

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 $416

Return flights