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

Return flights

19 Aug - 27 Aug	TAP
21 Aug - 29 Aug	TAP
19 Aug - 29 Aug	Finnair	direct
19 Aug - 29 Aug	TAP
17 Aug - 30 Aug	TAP
19 Aug - 28 Aug	Finnair	direct
19 Aug - 28 Aug	TAP
21 Aug - 25 Aug	TAP
17 Aug - 24 Aug	TAP
23 Aug - 30 Aug	TAP
31 Aug - 07 Sep	TAP
25 Aug - 01 Sep	TAP
30 Aug - 14 Sep	TAP
03 Aug - 08 Sep	KLM
31 Aug - 20 Sep	TAP
20 Aug - 06 Sep	Delta
27 Aug - 02 Sep	TAP
27 Aug - 03 Sep	TAP
19 Aug - 03 Sep	United	direct
03 Aug - 08 Sep	United	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 320€

Return flights