AirHint found the following cheapest one-way flights from Washington (IAD) to Madrid (MAD) in January 2026 (see full year).
One-Way flights
| 17 Jan | Frontier Airlines | ||
| 26 Jan | Frontier Airlines | ||
| 05 Jan | TAP | ||
| 15 Jan | TAP | ||
| 06 Jan | Lufthansa | ||
| 01 Jan | SWISS | ||
| 04 Jan | TAP | ||
| 15 Jan | Iberia | direct | |
| 03 Jan | SWISS | ||
| 06 Jan | Iberia | direct |
Also check the deals for return flights from Washington to Madrid in January.
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