AirHint found the following cheapest one-way flights from Washington (IAD) to Lisbon (LIS) in September 2026 (see full year).
One-Way flights
| 01 Sep | SWISS | ||
| 29 Sep | SWISS | ||
| 01 Sep | TAP | direct | |
| 29 Sep | TAP | direct |
Also check the deals for return flights from Washington to Lisbon in September.
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