AirHint found the following cheapest return flights from Portland (PDX) to Lisbon (LIS) in January 2026 (see full year).
Return flights
| 21 Jan - 28 Jan | SWISS | ||
| 25 Jan - 01 Feb | Air France | ||
| 18 Jan - 25 Jan | Delta | ||
| 23 Jan - 28 Jan | Delta |
Also check the deals for one-way flights from Portland to Lisbon in January.
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