AirHint found the following cheapest return flights from Portland (PDX) to Lisbon (LIS) in May 2026 (see full year).
Return flights
| 03 May - 23 May | Air Canada | ||
| 17 May - 24 May | Lufthansa | ||
| 18 May - 24 May | Air Canada | ||
| 20 May - 13 Jun | Lufthansa |
Also check the deals for one-way flights from Portland to Lisbon in May.
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