Find Alaska Airlines(AS) flights from Seattle to Lisbon

At the moment, you can catch a nonstop flight from Seattle to Lisbon with the following airlines, including: Alaska Airlines Selected airlines are based on historical data collected from flight bookings users made on Trip.com within the last 90 days.

By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Seattle to Lisbon is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

The cheapest months to fly from Seattle to Lisbon is October, when demand for travel is lower.

After crunching the numbers on our December flight calendar, it's currently cheapest to fly from Seattle to Lisbon on December 31, 2025 with Icelandair, with prices starting at SGD 358.

You can land at any one of the following hubs in Lisbon, with Seattle–Tacoma International Airport to Humberto Delgado Airport (SEA-LIS) is by far the most common option on this route: Humberto Delgado Airport (LIS).

The time difference between Lisbon and Seattle is 8h.

Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.