AirHint found the following cheapest one-way flights from Portland (PDX) to Lisbon (LIS) in December 2025 (see full year).
One-Way flights
| 30 Dec | Lufthansa | ||
| 31 Dec | Air Canada | ||
| 29 Dec | Air Canada | ||
| 28 Dec | Air Canada |
Also check the deals for return flights from Portland to Lisbon in December.
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