AirHint found the following cheapest one-way flights from Portland (PDX) to Lisbon (LIS) in May 2026 (see full year).
One-Way flights
| 01 May | United | ||
| 02 May | United | ||
| 04 May | United | ||
| 05 May | United | ||
| 03 May | Air France | ||
| 06 May | Delta | ||
| 09 May | British Airways | ||
| 07 May | Finnair | ||
| 08 May | Delta | ||
| 10 May | British Airways |
Also check the deals for return flights from Portland to Lisbon in May.
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