AirHint found the following cheapest one-way flights from Washington (IAD) to Madrid (MAD) in September 2026 (see full year).
One-Way flights
| 14 Sep | TAP | ||
| 13 Sep | Icelandair | ||
| 01 Sep | TAP | ||
| 11 Sep | Icelandair | ||
| 01 Sep | United | direct | |
| 14 Sep | United | direct | |
| 13 Sep | United | direct | |
| 11 Sep | United | direct |
Also check the deals for return flights from Washington to Madrid in September.
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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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