Cheapest return flights from Portland to Lisbon in May from $757

Best time to book flights for Portland (PDX) to Lisbon (LIS) flights at AirHint

AirHint found the following cheapest return flights from Portland (PDX) to Lisbon (LIS) in May 2025 (see full year).

Return flights

09 May - 17 May Frontier Airlines
10 May - 23 May Hawaiian Airlines
10 May - 17 May Hawaiian Airlines
09 May - 18 May Frontier Airlines
09 May - 16 May Lufthansa
08 May - 17 May Hawaiian Airlines
03 May - 10 May Hawaiian Airlines

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

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The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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