AirHint found the following cheapest one-way flights from Washington (IAD) to Lisbon (LIS) in May 2026 (see full year).
One-Way flights
| 06 May | Icelandair | ||
| 19 May | Frontier Airlines | ||
| 20 May | Icelandair | ||
| 21 May | Icelandair | ||
| 28 May | Frontier Airlines | ||
| 12 May | Icelandair | ||
| 03 May | TAP | direct | |
| 01 May | TAP | direct | |
| 06 May | United | direct | |
| 12 May | TAP | direct |
Also check the deals for return flights from Washington to Lisbon in May.
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