AirHint found the following cheapest one-way flights from Washington (IAD) to Madrid (MAD) in September 2026 (see full year).
One-Way flights
| 07 Sep | TAP | ||
| 29 Sep | TAP | ||
| 04 Sep | TAP | ||
| 29 Sep | Finnair | direct | |
| 07 Sep | Finnair | direct | |
| 04 Sep | American Airlines | direct | |
| 03 Sep | Iberia | direct |
Also check the deals for return flights from Washington to Madrid in September.
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