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

Return flights

04 May - 18 May	TAP
10 May - 21 May	TAP
05 May - 12 May	TAP
04 May - 11 May	TAP
10 May - 21 May	British Airways	direct
05 May - 12 May	British Airways	direct
14 May - 21 May	TAP
04 May - 18 May	British Airways	direct
04 May - 11 May	Iberia	direct
14 May - 21 May	Iberia	direct
25 May - 01 Jun	SWISS
25 May - 01 Jun	British Airways	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 396€

Return flights