AirHint found the following cheapest one-way flights from Washington (IAD) to Madrid (MAD) in March 2026 (see full year).
One-Way flights
| 22 Mar | TAP | ||
| 10 Mar | TAP | ||
| 24 Mar | SWISS | ||
| 21 Mar | Icelandair | ||
| 11 Mar | TAP | ||
| 29 Mar | Lufthansa | ||
| 18 Mar | Lufthansa | ||
| 30 Mar | Lufthansa | ||
| 19 Mar | TAP | ||
| 12 Mar | SWISS |
Also check the deals for return flights from Washington to Madrid in March.
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