Cheapest return flights from Portland to Lisbon in May from 739€

AirHint found the following cheapest return flights from Portland (PDX) to Lisbon (LIS) in May 2026 (see full year).

Return flights

29 May - 05 Jun Air Canada
27 May - 03 Jun Alaska Airlines
26 May - 02 Jun Air Canada
25 May - 01 Jun Air Canada
21 May - 11 Jun United
28 May - 04 Jun Air Canada
24 May - 31 May Air Canada
21 May - 30 May Alaska Airlines

Also check the deals for one-way flights from Portland to Lisbon in May.

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