AirHint found the following cheapest one-way flights from Washington (IAD) to Madrid (MAD) in April 2026 (see full year).
One-Way flights
| 10 Apr | Icelandair | ||
| 19 Apr | SWISS | ||
| 22 Apr | SWISS | ||
| 12 Apr | Brussels Airlines | ||
| 04 Apr | Frontier Airlines | ||
| 17 Apr | Icelandair | ||
| 05 Apr | TAP | ||
| 11 Apr | TAP | ||
| 01 Apr | Lufthansa | ||
| 03 Apr | Frontier Airlines |
Also check the deals for return flights from Washington to Madrid in April.
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