AirHint found the following cheapest one-way flights from Washington (IAD) to Madrid (MAD) in March 2026 (see full year).
One-Way flights
| 15 Mar | TAP | ||
| 08 Mar | TAP | ||
| 12 Mar | TAP | ||
| 15 Mar | Iberia | direct | |
| 08 Mar | United | direct |
Also check the deals for return flights from Washington to Madrid in March.
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