AirHint found the following cheapest return flights from Portland (PDX) to Lisbon (LIS) in May 2026 (see full year).
Return flights
| 26 May - 02 Jun | Alaska Airlines | ||
| 27 May - 03 Jun | Finnair | ||
| 29 May - 05 Jun | WestJet | ||
| 30 May - 06 Jun | WestJet | ||
| 31 May - 07 Jun | Icelandair | ||
| 28 May - 04 Jun | Air Canada |
Also check the deals for one-way flights from Portland to Lisbon in May.
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