$330 Cheap flights from Basel to Seattle (BSL to SEA)

Popular airlines from EuroAirport Airport (BSL) to Seattle-Tacoma International Airport (SEA)

British Airways
British Airways
Air France
Air France
KLM
KLM
Lufthansa
Lufthansa
American Airlines
American Airlines
Air Canada
Air Canada
Turkish Airlines
Turkish Airlines

Cheap Flights from Basel to Seattle (BSL-SEA)

Prices were available within the past 7 days and start at $330 for one-way flights and $554 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

All deals

One way

Roundtrip

Wed, Oct 29 - Wed, Nov 5

BSL

Basel

SEA

Seattle

$554

Roundtrip

found 2 days ago

Tue, Nov 11 - Tue, Nov 18

BSL

Basel

SEA

Seattle

$560

Roundtrip

found 7 hours ago

Fri, Mar 27 - Fri, Apr 10

BSL

Basel

SEA

Seattle

$560

Roundtrip

found 5 days ago

Tue, Nov 11 - Tue, Nov 18

BSL

Basel

SEA

Seattle

$562

Roundtrip

found 7 hours ago

Tue, Nov 11 - Tue, Nov 18

BSL

Basel

SEA

Seattle

$564

Roundtrip

found 7 hours ago

Mon, Oct 20 - Mon, Nov 3

BSL

Basel

SEA

Seattle

$567

Roundtrip

found 3 days ago

Fri, Mar 27 - Fri, Apr 10

BSL

Basel

SEA

Seattle

$569

Roundtrip

found 5 days ago

Tue, Nov 11 - Tue, Nov 18

BSL

Basel

SEA

Seattle

$605

Roundtrip

found 7 hours ago

Wed, Dec 24 - Wed, Dec 31

BSL

Basel

SEA

Seattle

$633

Roundtrip

found 1 day ago

Tue, Nov 11 - Tue, Nov 18

BSL

Basel

SEA

Seattle

$652

Roundtrip

found 7 hours ago

Frequently asked questions

How much does a flight from EuroAirport Airport (BSL) to Seattle - Tacoma Intl. Airport (SEA) cost?

Lock in a cheap one-way flight from $330 or cheap return flight from $554 from EuroAirport Airport (BSL) to Seattle - Tacoma Intl. Airport (SEA) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.

What is the cheapest month to fly from EuroAirport Airport (BSL) to Seattle - Tacoma Intl. Airport (SEA)?

Traveling in October may help you find better deals, as it's the cheapest month for flights between BSL and SEA. You'll often find the lowest prices during the off-season.

What is the cheapest airline that flies from EuroAirport Airport (BSL) to Seattle - Tacoma Intl. Airport (SEA)?

Use the filter tool on Expedia to compare airlines and find the most affordable carrier that'll fly you from BSL to SEA. Then, sort your results by "Price (lowest to highest)" to snag the best deal available.

How many flights per day from EuroAirport Airport (BSL) to Seattle - Tacoma Intl. Airport (SEA)?

You'll have to catch a flight with a layover when traveling from EuroAirport Airport (BSL) to Seattle - Tacoma Intl. Airport (SEA). Direct flights don't operate daily on this route. However, simply filter your search to include one or two stops to find an option that works for you.

What day of the week has the most flights from BSL to SEA?

You'll usually find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can change from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.

What is the best time to fly from EuroAirport Airport (BSL) to Seattle - Tacoma Intl. Airport (SEA)?

Choose a flight from EuroAirport Airport (BSL) to Seattle - Tacoma Intl. Airport (SEA) that takes off before 3 PM to reduce the likelihood of delays. Later departures are on average 22% more likely to be 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 EuroAirport Airport (BSL) to Seattle - Tacoma Intl. Airport (SEA) last-minute?

Booking your plane ticket from BSL to SEA just before your getaway is usually more expensive. But if you're flexible with your travel times and dates, you could score a cheap last-minute fare.

Is it cheaper to book a BSL to SEA flight and hotel package?

Booking a BSL to SEA flight and hotel package is generally cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Pick from our wide range of hotels and then add car rentals, activities and flights to your booking. Bundle it all together, and you could save hundreds of dollars.

Can I cancel or change the date of my flight from EuroAirport Airport (BSL) to Seattle - Tacoma Intl. Airport (SEA)?

If you booked your BSL to SEA flight in the last 24 hours, you may be able to modify or cancel it at no cost. Depending on the airline and the type of fare you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal for more details.

Travel information

Origin airport	EuroAirport
Destination airport	Seattle - Tacoma Intl.
Roundtrip price	$553
Distance	5210 mi

Book with confidence

Basel to Seattle Flights

The cheapest times to fly from Basel to Seattle

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

The best time to book a flight from Basel to Seattle

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

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 Basel to Seattle in 2025. You can also book with separate airlines for your outbound and return journeys, from $330 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 Basel to Seattle 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 Basel to Seattle 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.