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

Return flights

03 May - 19 May	United
06 May - 13 May	Iberia	direct
13 May - 06 Jun	Iberia	direct
07 May - 14 May	TAP
01 May - 08 May	TAP
03 May - 19 May	Iberia	direct
01 May - 08 May	Iberia	direct
14 May - 28 May	Turkish Airlines
26 May - 02 Jun	Iberia
25 May - 01 Jun	Iberia
21 May - 25 May	British Airways
16 May - 23 May	Iberia	direct
23 May - 30 May	British Airways
22 May - 13 Jun	Aer Lingus
30 May - 20 Jun	Air Canada
25 May - 01 Jun	Finnair	direct
22 May - 13 Jun	Iberia	direct
30 May - 20 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 $533

Return flights