AirHint found the following cheapest one-way flights from Portland (PDX) to Lisbon (LIS) in August 2026 (see full year).
One-Way flights
| 11 Aug | United | ||
| 12 Aug | United | ||
| 18 Aug | United | ||
| 10 Aug | United | ||
| 19 Aug | United | ||
| 15 Aug | United | ||
| 20 Aug | United | ||
| 13 Aug | United | ||
| 14 Aug | United | ||
| 17 Aug | Air France |
Also check the deals for return flights from Portland to Lisbon in August.
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