AirHint found the following cheapest one-way flights from Washington (IAD) to Madrid (MAD) in May 2026 (see full year).
One-Way flights
| 10 May | Aer Lingus | ||
| 13 May | Aer Lingus | ||
| 17 May | SWISS | ||
| 09 May | Icelandair | ||
| 25 May | Lufthansa | ||
| 15 May | Icelandair | ||
| 03 May | United | direct | |
| 10 May | Iberia | direct | |
| 14 May | Frontier Airlines | ||
| 31 May | SWISS |
Also check the deals for return flights from Washington to Madrid in May.
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