$371 Cheap Flights from Seattle (SEA) to Lisbon (LIS)

Seattle (SEA) to Lisbon (LIS) at a glance

Embark on an exciting journey from Seattle (SEA) to Lisbon (LIS) with a selection of airlines offering this international long-haul route. Choose between full-service and budget carriers to discover the flight that aligns with your budget, schedule, and travel preferences as you delve into the iconic sights and neighborhoods of Lisbon. Below, you’ll find essential information for flights departing from Seattle-Tacoma International Airport (SEA) to Humberto Delgado Airport (LIS).

• Fastest flight duration: around 12h 15m in-flight, plus roughly 3h 15m layover with one stop
• Route distance: roughly 5,200 miles (8,370 km)
• Flights per week: around 13 departures on average
• Typical fares (one-way): economy tickets often range from $250–$940, depending on seasonality and how far ahead you book

Flights from Seattle - Tacoma International Airport (SEA) to Humberto Delgado Airport (LIS)

Based on recent travel bookings, here are the top airlines favored by travelers flying from Seattle to Lisbon, especially for one-stop and multi-stop flights. Common layovers include Heathrow Airport (LHR) with an average layover of about 2 hours and 30 minutes, Pearson International Airport (YYZ) at roughly 3 hours and 15 minutes, and Keflavik International Airport (KEF) with a 2-hour layover. These options allow you to tailor your journey based on price, total travel time, and cabin class to create your ideal itinerary.

• United: This full-service airline provides one-stop journeys, typically charging one-way fares between $265 and $815. It represents around 19% of the departures on this route, with a flight duration of 12 hours and 15 minutes, culminating in a total travel time of about 15 hours and 30 minutes, including layovers.
• British Airways: Another full-service option, British Airways offers one-stop flights, with one-way fares generally ranging from $250 to $1025. This carrier accounts for roughly 18% of the flights on this route, featuring an in-flight time of 12 hours and 15 minutes and a total journey time of approximately 15 hours and 30 minutes, factoring in layovers.
• Air Canada: This full-service carrier provides both one-stop and multi-stop options, with one-way fares usually between $250 and $1025. Air Canada makes up about 11% of the departures on this route, offering a standard in-flight duration of 12 hours and 15 minutes, leading to a total travel time close to 15 hours and 30 minutes.
• Delta: As a full-service provider, Delta offers one-stop service with one-way fares that typically range from $250 to $1395. It accounts for around 10% of the departures on this route, featuring an in-flight time of 12 hours and 15 minutes, while the overall journey time is about 15 hours and 30 minutes, including a layover.
• Icelandair: This full-service airline presents one-stop and multi-stop travel options, with one-way fares typically between $250 and $1915. Representing about 7% of departures on this route, Icelandair provides a standard in-flight duration of 12 hours and 15 minutes, culminating in a total journey time of roughly 15 hours and 30 minutes.

Travelers have the option to enhance their journey from Seattle to Lisbon with upgraded seating. Leading airlines offering Business Class include Icelandair, American Airlines, and British Airways, providing exceptional service for a more enjoyable flying experience.

Best time to fly from Seattle (SEA) to Lisbon (LIS)

The most popular months for travelers flying from Seattle to Lisbon are March, April, and July, when peak temperatures in Lisbon reach up to 71.1°F in July. If you prefer quieter travel, consider January, the least busy and relatively cheaper time to visit with fewer crowds and temperatures around 54°F. For better deals, February usually offers the lowest average one-way fare around $430. Flight availability peaks in April, September, and December, with approximately 16 flights per week, making it easier to find convenient departure times.

• Cheapest time to fly: February usually offers good deals with average one-way fare around $430, roughly 29% cheaper than the yearly average.
• Another budget-friendly time to fly: January typically offers an average one-way fare of around $461.
• Most flight options: April, September, and December have the highest number of flights from Seattle to Lisbon, with approximately 16 flights per week, giving you more flexibility in scheduling your trip.

*Average one-way fare is based on Expedia flight booking data from January 2025 to April 2026 for the specified route and travel class and may change depending on availability, dates, and demand.

Alternative routes from Seattle (SEA) to Lisbon (LIS)

• Seattle to Lisbon (BFI-LIS): Located approximately 6 miles from Seattle - Tacoma International Airport (SEA), Boeing Field Airport (BFI) serves as a convenient option for travelers.
• Seattle to Cascais (SEA-CAT): Cascais Airport (CAT) lies roughly 12 miles from Humberto Delgado Airport (LIS), providing easy access for those heading to Lisbon.

How to find the best prices for flights from Seattle (SEA) to Lisbon (LIS)

Getting some of the best deals on flights from Seattle to Lisbon is all about timing and flexibility. Here are some key tips to help you save:

1. Best times to book and fly: cheaper fares are usually found when booking at least two months in advance, which aligns with when most travelers make their reservations. Evening departures from 6 PM to 12 AM often offer lower prices, while afternoon flights from 12 PM to 6 PM are the most popular. Additionally, flying on Saturday typically results in cheaper fares, although Wednesday is the most favored travel day.
2. Set up price alerts: stay updated on price changes by using Expedia's Price Tracker. Receive alerts when fares drop for your selected route.
3. Bundle and save: bundle your flight and hotel to save on Expedia, or unlock a hotel deal after booking your flight.* Find Lisbon hotel and flight deals.
4. Compare flight options: use Expedia's search tool to compare airlines, routes, direct vs. non-direct flights, and flight times. You can also sort by price to find the most affordable options.
5. Stay flexible with dates: being open to different travel days can sometimes help you find better prices on flights and hotels.
6. Think about luggage: nowadays, it's important to check the airline's baggage policies to find the best value. That may be paying for an additional carry-on bag or booking a ticket with checked luggage included. Either way, double-check your allowance before confirming your booking to avoid excess baggage fees at the airport.

*Members only. Savings vary and are not available on all bundles. Select hotels.

Arriving at Humberto Delgado Airport from Seattle - Tacoma International Airport

Lisbon welcomes travelers from Seattle with a range of transport options based on price, convenience, and proximity. For departures, Seattle - Tacoma International Airport is roughly a 20-minute drive (covering about 14 miles) from central Seattle. Here's how to reach Lisbon efficiently:

• Hotel transfer: Transfers offer a convenient way to reach your hotel in Lisbon, with options including free hotel shuttles and private rides, which can be arranged in advance with your hotel.
• Car rental: Renting a car from Humberto Delgado Airport is a great option if you plan to explore and sightsee beyond the city. Browse cheap car rentals at Humberto Delgado Airport on Expedia.
• Taxi/ride-hailing: Taxis and ride-hailing services may be available from designated pickup areas outside the terminal, check locally on arrival.
• Public transportation: From Humberto Delgado Airport, Lisbon Airport Station (a metro station) is located about 0.1 miles away on foot, while Oriente Bus Station (a bus station) and Roma-Areeiro Station (a train station) are both situated about 1.8 miles away by car, providing convenient transport options for travelers heading into the city.

Seattle to Lisbon Flights

The cheapest times to fly from Seattle to Lisbon

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Seattle to Lisbon are during the month of October. You can find some of the cheapest flights from Seattle to Lisbon with Expedia's search tool and vast selection of airlines.

The best time to book a flight from Seattle to Lisbon

Sunday is one of the best days to book for cheap flights from Seattle to Lisbon: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

How to find cheap round-trip tickets from Seattle to Lisbon

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Seattle to Lisbon in 2026. You can also book with separate airlines for your outbound and return journeys, from $371 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Seattle to Lisbon flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

You could also save big by booking one of Expedia's vacation packages. Bundling together your Seattle to Lisbon airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

*Terms apply.

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.