Cheapest return flights from Seattle to Lisbon in May from $759

Best time to book flights for Seattle (SEA) to Lisbon (LIS) flights at AirHint

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

Return flights

12 May - 22 May Icelandair
14 May - 22 May Delta
17 May - 24 May Frontier Airlines
05 May - 17 May Icelandair
20 May - 05 Jun Hawaiian Airlines
17 May - 30 May Frontier Airlines
13 May - 17 May Icelandair
10 May - 17 May Hawaiian Airlines
04 May - 15 May Icelandair
03 May - 11 May Aer Lingus
04 May - 09 May Frontier Airlines
07 May - 04 Jun American Airlines

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

Skyscanner

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.

Book a cheap hotel in Lisbon

Cheap car rent in Lisbon