AirHint found the following cheapest one-way flights from Washington (IAD) to Lisbon (LIS) in March 2026 (see full year).
One-Way flights
| 30 Mar | SWISS | ||
| 23 Mar | Breeze Airways | ||
| 29 Mar | Turkish Airlines | ||
| 30 Mar | TAP | direct | |
| 22 Mar | ITA Airways | ||
| 23 Mar | TAP | direct | |
| 31 Mar | Aer Lingus | ||
| 25 Mar | Austrian Airlines | ||
| 26 Mar | Turkish Airlines | ||
| 31 Mar | TAP | direct |
Also check the deals for return flights from Washington to Lisbon in March.
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