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$359+ 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 3/17. Fares are subject to change and may not be available on all flights or dates of travel.
BSL — SEA
Jan 27 — Feb 31
Tue 1/27
Tue 2/3
1 adult, Economy
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Cheap flight deals from Basel to Seattle

Best flights from Basel to Seattle
Discover carefully curated flight deals from Basel to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 28, 2025.

This American Airlines deal was found by Cheapflights users on 12/25. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/196:05 amBSL - SEA
1 stop19h 50mAmerican Airlines
Mon 3/21:39 pmSEA - BSL
2 stops19h 36mAmerican Airlines
Deal found 12/25$527
This British Airways deal was found by Cheapflights users on 12/25. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/196:05 amBSL - SEA
1 stop19h 50mBritish Airways
Mon 3/26:50 pmSEA - BSL
1 stop30h 25mBritish Airways
Deal found 12/25$529
This Iberia deal was found by Cheapflights users on 12/27. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/247:10 amBSL - SEA
1 stop13h 20mMultiple Airlines
Wed 1/288:35 amSEA - BSL
2 stops21h 20mMultiple Airlines
Deal found 12/27$532
This Delta deal was found by Cheapflights users on 12/26. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/236:05 amBSL - SEA
1 stop14h 45mDelta
Tue 1/271:40 pmSEA - BSL
1 stop15h 10mDelta
Deal found 12/26$635
This American Airlines deal was found by Cheapflights users on 12/26. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/37:00 amBSL - SEA
1 stop18h 55mAmerican Airlines
Tue 3/172:25 pmSEA - BSL
1 stop16h 40mAmerican Airlines
Deal found 12/26$528
This British Airways deal was found by Cheapflights users on 12/27. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/247:10 amBSL - SEA
1 stop18h 45mBritish Airways
Wed 1/286:50 pmSEA - BSL
1 stop35h 15mBritish Airways
Deal found 12/27$531
This American Airlines deal was found by Cheapflights users on 12/26. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/237:00 amBSL - SEA
2 stops24h 07mAmerican Airlines
Tue 1/278:04 amSEA - BSL
2 stops22h 01mAmerican Airlines
Deal found 12/26$533
This Finnair deal was found by Cheapflights users on 12/27. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/317:05 amBSL - SEA
1 stop13h 30mMultiple Airlines
Sun 6/211:35 pmSEA - BSL
1 stop12h 45mMultiple Airlines
Deal found 12/27$611

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 December 28, 2025.

Round-trip from

$522
(Billigflug)

One-way from

$359
(American Airlines)

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
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($75 potential increase over avg. RT price).
Search Deals
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 December 28, 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

Thu 2/19

6:05 am-4:55 pm

1 stop19h 50m

Seattle/Tacoma Intl

Mon 3/2

1:39 pm-6:15 pm

2 stops19h 36m

$527

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Tue 3/3

7:00 am-4:55 pm

1 stop18h 55m

Seattle/Tacoma Intl

Tue 3/17

2:25 pm-3:05 pm

1 stop16h 40m

$528

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Thu 2/19

6:05 am-4:55 pm

1 stop19h 50m

Seattle/Tacoma Intl

Mon 3/2

6:50 pm-10:15 am

1 stop30h 25m

$529

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Sat 1/24

7:10 am-4:55 pm

1 stop18h 45m

Seattle/Tacoma Intl

Wed 1/28

6:50 pm-3:05 pm

1 stop35h 15m

$531

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Sat 1/24

7:10 am-11:30 am

1 stop13h 20m

Seattle/Tacoma Intl

Wed 1/28

8:35 am-2:55 pm

2 stops21h 20m

$532

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Fri 1/23

7:00 am-10:07 pm

2 stops24h 07m

Seattle/Tacoma Intl

Tue 1/27

8:04 am-3:05 pm

2 stops22h 01m

$533

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Sun 5/31

7:05 am-11:35 am

1 stop13h 30m

Seattle/Tacoma Intl

Sun 6/21

1:35 pm-11:20 am

1 stop12h 45m

$611

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Fri 1/23

6:05 am-11:50 am

1 stop14h 45m

Seattle/Tacoma Intl

Tue 1/27

1:40 pm-1:50 pm

1 stop15h 10m

$635

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Tue 3/17

7:00 am-12:30 pm

1 stop13h 30m

$359

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Tue 3/17

7:00 am-9:54 pm

2 stops22h 54m

$367

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/25

Showing 1-10 of 15 results
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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 19h 50m. 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
SeaTac
Lakewood
Ocean Shores
Olympia
Edmonds
Lynnwood
Renton
Puyallup
Kirkland
Kent
Tukwila
Cle Elum
Marysville
Fife
Aberdeen
Shoreline
Centralia
Federal Way
Chehalis

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