$936 Cheap Flights from Seattle (SEA) to Lille (LIL)

View $936 flight on Sun, Jan 4, 2026Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to Lille (LIL-Lesquin)

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Cheap Flights from Seattle to Lille (SEA-LIL)

Prices were available within the past 7 days and start at $936 for one-way flights and for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

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Flights from Seattle (SEA) to Lille (LIL)
Origin airport
Seattle - Tacoma Intl.
Destination airport
Lesquin
Distance
4928 mi

Seattle to Lille Flights

The cheapest times to fly from Seattle to Lille

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 Lille are during the month of . You can find some of the cheapest flights from Seattle to Lille with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Seattle to Lille

Sunday is one of the best days to book for cheap flights from Seattle to Lille: 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 Lille

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 Lille in 2025. You can also book with separate airlines for your outbound and return journeys, from $936 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 Lille 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 Lille 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.

 

Frequently asked questions

How much does a flight from Seattle - Tacoma Intl. Airport (SEA) to Lesquin Airport (LIL) cost?
Get a cheap one-way flight from $936 or cheap return flight from Seattle - Tacoma Intl. Airport (SEA) to Lesquin Airport (LIL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Seattle - Tacoma Intl. Airport (SEA) to Lesquin Airport (LIL)?
is the least expensive month to fly from SEA to LIL. Traveling during an off-peak travel window is often the key to finding a great deal.
What is the cheapest airline that flies from Seattle - Tacoma Intl. Airport (SEA) to Lesquin Airport (LIL)?
Use the filter tool on Expedia to compare different airlines and find the most affordable carrier that'll take you from SEA to LIL. Then, sort your results by "Price (lowest to highest)" to snag a great deal.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to Lesquin Airport (LIL)?
Nonstop flights from Seattle - Tacoma Intl. Airport (SEA) to Lesquin Airport (LIL) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filters. Enter your travel details and pick either "1 Stop" or "2+ Stops."
What day of the week has the most flights from SEA to LIL?
Generally you'll find the most flight options available on a Friday. Tuesdays are often the quietest.* However, this can change depending on the time of year, airline and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Seattle - Tacoma Intl. Airport (SEA) to Lesquin Airport (LIL)?
To avoid possible delays on the Seattle - Tacoma Intl. Airport (SEA) to Lesquin Airport (LIL) route, aim to fly before 3 PM. Later departures have a 22% higher chance of being canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Seattle - Tacoma Intl. Airport (SEA) to Lesquin Airport (LIL) last-minute?
Last-minute fares from SEA to LIL are usually more expensive. To lock in the cheapest rates, start looking for flights well ahead of time. That said, if you're flexible with your travel plans, it's possible to find a cheap fare right before your journey.
Is it cheaper to book a SEA to LIL flight and hotel package?
Booking a SEA to LIL flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Pick from our impressive range of hotels and then add activities, flights and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Seattle - Tacoma Intl. Airport (SEA) to Lesquin Airport (LIL)?
Typically, you can cancel or modify your SEA to LIL flight. However, there may be additional charges, especially if your booking was made over 24 hours ago. Double-check your itinerary for the airline's fees and rules on flight changes, or if you need further information, head to our Customer Service portal.

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*Available to One Key members.