Cheapest one-way flights from Washington to Madrid in September from $735

Best time to book flights for Washington (IAD) to Madrid (MAD) flights at AirHint

AirHint found the following cheapest one-way flights from Washington (IAD) to Madrid (MAD) in September 2025 (see full year).

One-Way flights

09 Sep American Airlines direct

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

Skyscanner

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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