AirHint found the following cheapest one-way flights from Washington (IAD) to Madrid (MAD) in September 2026 (see full year).
One-Way flights
| 23 Sep | Brussels Airlines | ||
| 21 Sep | TAP | ||
| 30 Sep | TAP | ||
| 30 Sep | Aer Lingus | direct | |
| 23 Sep | Aer Lingus | direct | |
| 21 Sep | Iberia | direct |
Also check the deals for return flights from Washington to Madrid in September.
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