AirHint found the following cheapest return flights from Washington (DCA) to Madrid (MAD) in May 2026 (see full year).

Return flights

20 May - 26 May	KLM
06 May - 13 May	Delta
12 May - 19 May	British Airways
05 May - 12 May	Iberia
21 May - 26 May	American Airlines
02 May - 23 May	Iberia
13 May - 31 May	Delta
11 May - 17 May	British Airways
11 May - 18 May	British Airways
01 May - 07 May	British Airways
14 May - 01 Jun	American Airlines
15 May - 01 Jun	American Airlines
25 May - 03 Jun	American Airlines
30 May - 06 Jun	Iberia
25 May - 01 Jun	Iberia
25 May - 29 Jun	KLM
25 May - 12 Jun	Iberia

Also check the deals for one-way flights from Washington to Madrid in May.

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 May from $539

Return flights