Cheapest one-way flights from Washington to Madrid in May from $357

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

One-Way flights

10 May Aer Lingus
03 May TAP
01 May Royal Air Maroc
02 May TAP
10 May Brussels Airlines direct
15 May Scandinavian Airlines
03 May Finnair direct
01 May Iberia direct
15 May Iberia direct
02 May Finnair direct

Also check the deals for return flights from Washington to Madrid in May.

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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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