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$475+ 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 4/12. Fares are subject to change and may not be available on all flights or dates of travel.
BSL — SEA
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
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 December 18, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 12/17. 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.
Fri 12/1911:15 amBSL - SEA
2 stops16h 14mBritish Airways
Fri 1/26:50 pmSEA - BSL
1 stop13h 15mBritish Airways
Deal found 12/17$5,040
This Cheapflightsfares deal was found by Cheapflights users on 12/17. 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.
Fri 12/197:00 amBSL - SEA
1 stop13h 30mMultiple Airlines
Fri 1/26:50 pmSEA - BSL
1 stop13h 15mMultiple Airlines
Deal found 12/17$5,160

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 18, 2025.

Round-trip from

$614
(American Airlines)

One-way from

$475
(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 December 18, 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

$614

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Fri 3/6

7:00 am-4:55 pm

1 stop18h 55m

Seattle/Tacoma Intl

Tue 3/10

7:50 pm-2:55 pm

1 stop35h 05m

$614

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Thu 2/19

11:05 am-11:29 pm

2 stops21h 24m

Seattle/Tacoma Intl

Mon 3/2

2:18 pm-6:15 pm

2 stops18h 57m

$626

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Fri 3/6

9:50 am-1:20 pm

1 stop12h 30m

Seattle/Tacoma Intl

Tue 3/10

8:59 am-12:30 pm

3 stops19h 31m

$681

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Sun 4/12

7:05 am-11:35 am

1 stop13h 30m

$475

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Fri 1/16

7:00 am-11:30 am

1 stop13h 30m

$769

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Mon 4/13

11:00 am-3:40 pm

1 stop13h 40m

$893

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Wed 1/21

11:10 am-6:43 pm

2 stops16h 33m

$897

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Mon 1/19

10:55 am-6:43 pm

2 stops16h 48m

$899

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Mon 12/29

10:55 am-6:29 pm

2 stops16h 34m

$2,468

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/18

Showing 1-10 of 14 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?

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