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

Return flights

05 May - 12 May	Iberia
19 May - 27 May	Brussels Airlines
10 May - 17 May	British Airways
10 May - 17 May	Aer Lingus	direct
18 May - 28 May	United
17 May - 27 May	United
18 May - 27 May	United
19 May - 28 May	United
19 May - 03 Jun	United
20 May - 03 Jun	Lufthansa
19 May - 25 May	SWISS
10 May - 16 May	SWISS
27 May - 03 Jun	TAP
21 May - 03 Jun	TAP
21 May - 02 Jun	TAP
15 May - 09 Jun	British Airways
26 May - 02 Jun	TAP
26 May - 03 Jun	TAP
15 May - 09 Jun	Iberia	direct
19 May - 03 Jun	Iberia	direct

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 418€

Return flights