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$394+ Cheap flights from Basel EuroAirport Swiss (BSL) to Seattle (SEA)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/14. Fares are subject to change and may not be available on all flights or dates of travel.
BSL — SEA
janv. 9 — janv. 161
ven. 1/9
ven. 1/16
1 adult, Economy
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Cheap flight deals from Basel to Seattle

Cheapest flights from Basel to Seattle
Explore the most affordable flight options available from Basel to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on décembre 10, 2025.

This United Airlines deal was found by Cheapflights users on 12/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sam. 12/279:50 amBSL - SEA
2 stops35h 37mUnited Airlines
mar. 1/66:03 amSEA - BSL
2 stops28h 37mUnited Airlines
Deal found 12/8$1,181
This Air France deal was found by Cheapflights users on 12/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sam. 12/2710:55 amBSL - SEA
1 stop35h 30mAir France
mar. 1/67:10 amSEA - BSL
2 stops17h 40mAir France
Deal found 12/8$1,188
This Cheapflightsfares deal was found by Cheapflights users on 12/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/167:00 amBSL - SEA
1 stop13h 30mBritish Airways
mer. 7/11:35 pmSEA - BSL
1 stop12h 45mBritish Airways
Deal found 12/9$3,062
This Cheapflightsfares deal was found by Cheapflights users on 12/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven. 12/199:50 amBSL - SEA
1 stop12h 30mMultiple Airlines
ven. 1/28:30 amSEA - BSL
2 stops16h 35mMultiple Airlines
Deal found 12/8$4,409
This Cheapflightsfares deal was found by Cheapflights users on 12/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/167:00 amBSL - SEA
1 stop13h 30mMultiple Airlines
mer. 7/11:45 pmSEA - BSL
2 stops15h 15mMultiple Airlines
Deal found 12/9$6,489

Find flight deals from Basel to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Basel (BSL) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated décembre 10, 2025.

Round-trip from

$607
(American Airlines)

One-way from

$394
(Cheapflightsfares)

Popular in

July

Cheapest in

September

Average price

$829
From Basel EuroAirport Swiss to Seattle/Tacoma Intl
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One-way flight from Basel EuroAirport Swiss to Seattle/Tacoma Intl
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Highest demand for flights based on searches. 9% potential increase in price ($75 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($18 potential savings vs. average RT price).
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Average for round-trip flights in December 2025
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Basel to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated décembre 10, 2025.
Use the filters below to find and compare flights from Basel EuroAirport Swiss to Seattle that are best for you.

Fly from

Basel

Fly to

Seattle

Route

Depart

Return

Price

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

ven. 3/6

11:15 am-4:55 pm

1 stop14h 40m

Seattle/Tacoma Intl

mar. 3/10

7:50 pm-10:20 pm

1 stop18h 30m

$607

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

jeu. 2/19

11:05 am-11:30 am

1 stop33h 25m

Seattle/Tacoma Intl

lun. 3/2

6:00 am-6:15 pm

2 stops27h 15m

$608

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

sam. 2/14

7:10 am-11:30 am

1 stop13h 20m

$394

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

ven. 2/6

7:00 am-11:30 am

1 stop13h 30m

$394

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

mar. 4/7

11:55 am-9:54 pm

2 stops18h 59m

$801

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

mar. 1/6

7:00 am-11:30 am

1 stop13h 30m

$3,038

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

mar. 4/7

8:20 am-12:20 pm

1 stop13h 00m

$3,349

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/9

Best time to book a flight from Basel to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Basel with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Related info for your journey

Find useful and relevant information for your journey from Basel to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Basel EuroAirport Swiss to Seattle?

    Departing from Basel EuroAirport Swiss to Seattle will take you 14h 40m. Airlines will cover a distance of 5207 mi.

  • Can I find deals for flights from Basel to Seattle that include hotel bookings?

    Yes. In addition to deals on Basel to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Basel to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Basel to Seattle.

  • Can I find deals for business class flights from Basel to Seattle?

    Yes. Cheapflights offers flight deals from Basel to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Tacoma
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Renton
Puyallup
Kirkland
Tukwila
Kent
Cle Elum
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