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

Return flights

05 May - 19 May	Brussels Airlines
03 May - 12 May	British Airways
03 May - 12 May	Iberia	direct
05 May - 15 May	ITA Airways
03 May - 20 May	United	direct
05 May - 12 May	Iberia	direct
06 May - 15 May	United
05 May - 15 May	Iberia	direct
03 May - 10 May	TAP
20 May - 27 May	Air Canada
20 May - 02 Jun	United
20 May - 03 Jun	United
26 May - 02 Jun	TAP
27 May - 04 Jun	TAP
24 May - 07 Jun	TAP
28 May - 04 Jun	TAP
28 May - 02 Jun	TAP
27 May - 04 Jun	United	direct
28 May - 06 Jun	TAP
20 May - 02 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 436€

Return flights