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$478+ 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 1/19. Fares are subject to change and may not be available on all flights or dates of travel.
BSL — SEA
Dec 5 — Dec 121
Fri 12/5
Fri 12/12
1 adult, Economy
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Find 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 November 5, 2025.

This American Airlines deal was found by Cheapflights users on 11/5. 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 11/217:00 amBSL - SEA
2 stops22h 59mAmerican Airlines
Tue 11/251:53 pmSEA - BSL
2 stops23h 27mAmerican Airlines
Deal found 11/5$587
This Delta deal was found by Cheapflights users on 11/5. 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 11/216:05 amBSL - SEA
1 stop14h 40mDelta
Tue 11/251:40 pmSEA - BSL
1 stop15h 10mDelta
Deal found 11/5$596
This CheapTickets.ch deal was found by Cheapflights users on 11/5. 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 CheapTickets.ch is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/196:45 amBSL - SEA
1 stop14h 25mLufthansa
Fri 1/23:10 pmSEA - BSL
1 stop33h 00mLufthansa
Deal found 11/5$926
This Kiwi.com deal was found by Cheapflights users on 11/5. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/196:05 amBSL - SEA
2 stops37h 30mKLM
Fri 1/22:10 pmSEA - BSL
1 stop34h 40mKLM
Deal found 11/5$1,115
This Expedia deal was found by Cheapflights users on 11/5. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/207:05 pmBSL - SEA
2 stops34h 52mLufthansa
Sat 12/277:00 amSEA - BSL
2 stops41h 10mLufthansa
Deal found 11/5$1,161
This Flysmarter deal was found by Cheapflights users on 11/5. 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 Flysmarter is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/196:05 amBSL - SEA
1 stop14h 45mAir France
Fri 1/22:10 pmSEA - BSL
1 stop34h 40mAir France
Deal found 11/5$1,181

Cheap 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 November 5, 2025.

Round-trip from

$582
(American Airlines)

One-way from

$478
(Cheapflightsfares)

Popular in

July

Cheapest in

November

Average price

$523
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. 12% potential increase in price ($98 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($20 potential savings vs. average RT price).
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Average for round-trip flights in November 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 November 5, 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

Mon 2/9

6:15 am-4:55 pm

1 stop19h 40m

Seattle/Tacoma Intl

Sat 2/28

6:50 pm-6:05 pm

1 stop14h 15m

$582

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Thu 2/19

11:05 am-4:55 pm

1 stop14h 50m

Seattle/Tacoma Intl

Mon 3/2

6:50 pm-9:35 pm

1 stop17h 45m

$584

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Thu 2/19

6:05 am-7:15 pm

2 stops22h 10m

Seattle/Tacoma Intl

Mon 3/2

6:50 pm-6:15 pm

1 stop14h 25m

$587

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Fri 11/21

6:05 am-11:45 am

1 stop14h 40m

Seattle/Tacoma Intl

Tue 11/25

1:40 pm-1:50 pm

1 stop15h 10m

$596

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Thu 2/19

6:05 am-11:40 am

1 stop14h 35m

Seattle/Tacoma Intl

Mon 3/2

2:10 pm-1:50 pm

1 stop14h 40m

$598

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Sat 1/10

9:50 am-10:16 pm

2 stops21h 26m

Seattle/Tacoma Intl

Sat 1/24

2:00 pm-1:35 pm

1 stop14h 35m

$690

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Mon 1/19

10:55 am-6:43 pm

2 stops16h 48m

$478

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Tue 12/16

7:00 am-11:30 am

1 stop13h 30m

$709

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Tue 12/23

7:00 am-11:30 am

1 stop13h 30m

$862

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Wed 11/19

11:10 am-6:48 pm

2 stops16h 38m

$879

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/5

Showing 1-10 of 16 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.

Cheapflights Insights

Everything you need to know about your flight from Basel EuroAirport Swiss to Seattle

How much does it cost to fly round-trip from Basel EuroAirport Swiss to Seattle?

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 50m. Airlines will cover a distance of 5207 mi. This flight may include one or multiple stops.

  • 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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