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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 3/24. Fares are subject to change and may not be available on all flights or dates of travel.
BSL — SEA
Feb 7 — Feb 141
Sat 2/7
Sat 2/14
1 adult, Economy
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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 January 8, 2026.

Round-trip from

$527
(British Airways)

One-way from

$359
(American Airlines)

Popular in

July

Cheapest in

September

Average price

$730
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 ($74 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 January 2026
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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 January 8, 2026.

This American Airlines deal was found by Cheapflights users on 1/7. 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.
Sun 11/16:35 amBSL - SEA
1 stop19h 20mAmerican Airlines
Sat 11/71:53 pmSEA - BSL
2 stops22h 57mAmerican Airlines
Deal found 1/7$526
This British Airways deal was found by Cheapflights users on 1/8. 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 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 stop14h 25mBritish Airways
Deal found 1/8$527
This British Airways deal was found by Cheapflights users on 1/7. 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 2/511:05 amBSL - SEA
1 stop33h 25mBritish Airways
Mon 2/96:50 pmSEA - BSL
1 stop17h 45mBritish Airways
Deal found 1/7$528
This American Airlines deal was found by Cheapflights users on 1/8. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/196:05 amBSL - SEA
2 stops24h 52mAmerican Airlines
Mon 3/26:00 amSEA - BSL
2 stops27h 15mAmerican Airlines
Deal found 1/8$531
This American Airlines deal was found by Cheapflights users on 1/7. 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 9/88:15 amBSL - SEA
2 stops19h 41mAmerican Airlines
Sun 9/138:20 pmSEA - BSL
1 stop17h 30mAmerican Airlines
Deal found 1/7$534
This Iberia deal was found by Cheapflights users on 1/7. 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.
Thu 2/511:05 amBSL - SEA
2 stops20h 15mMultiple Airlines
Mon 2/98:35 amSEA - BSL
2 stops24h 40mMultiple Airlines
Deal found 1/7$536
This American Airlines deal was found by Cheapflights users on 1/7. 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 8/286:00 amBSL - SEA
1 stop14h 35mAmerican Airlines
Tue 9/18:20 pmSEA - BSL
1 stop17h 30mAmerican Airlines
Deal found 1/7$549
This British Airways deal was found by Cheapflights users on 1/6. 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.
Fri 8/286:00 amBSL - SEA
1 stop14h 35mBritish Airways
Tue 9/18:20 pmSEA - BSL
1 stop17h 30mBritish Airways
Deal found 1/6$553
This Iberia deal was found by Cheapflights users on 1/7. 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.
Tue 9/88:15 amBSL - SEA
2 stops20h 47mMultiple Airlines
Sun 9/133:12 pmSEA - BSL
2 stops18h 08mMultiple Airlines
Deal found 1/7$559
This Expedia deal was found by Cheapflights users on 1/7. 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.
Thu 2/510:30 amBSL - SEA
2 stops20h 55mAir France
Mon 2/97:10 amSEA - BSL
2 stops17h 40mAir France
Deal found 1/7$687
This United Airlines deal was found by Cheapflights users on 1/8. 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.
Sun 2/229:50 amBSL - SEA
2 stops21h 26mUnited Airlines
Sun 3/110:55 amSEA - BSL
2 stops16h 35mUnited Airlines
Deal found 1/8$800

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 January 8, 2026.
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

6:50 pm-6:15 pm

1 stop14h 25m

$527

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Thu 2/5

3:40 pm-11:30 am

1 stop28h 50m

Seattle/Tacoma Intl

Mon 2/9

8:04 am-6:15 pm

2 stops25h 11m

$528

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Thu 2/19

6:05 am-9:57 pm

2 stops24h 52m

Seattle/Tacoma Intl

Mon 3/2

6:00 am-6:15 pm

2 stops27h 15m

$531

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Thu 2/5

11:05 am-10:20 pm

2 stops20h 15m

Seattle/Tacoma Intl

Mon 2/9

8:35 am-6:15 pm

2 stops24h 40m

$536

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Thu 2/5

10:30 am-10:25 pm

2 stops20h 55m

Seattle/Tacoma Intl

Mon 2/9

7:10 am-9:50 am

2 stops17h 40m

$687

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Sun 2/22

9:50 am-10:16 pm

2 stops21h 26m

Seattle/Tacoma Intl

Sun 3/1

10:55 am-12:30 pm

2 stops16h 35m

$800

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Sat 2/28

7:10 am-11:30 am

1 stop13h 20m

Seattle/Tacoma Intl

Wed 3/11

1:37 pm-2:55 pm

2 stops17h 18m

$5,827

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Tue 3/24

7:00 am-12:30 pm

1 stop13h 30m

$359

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Wed 6/3

6:40 am-6:25 pm

1 stop20h 45m

$360

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Wed 6/3

6:40 am-5:58 pm

2 stops20h 18m

$366

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/8

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.

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
Lynnwood
Edmonds
Renton
Puyallup
Kirkland
Kent
Tukwila
Marysville
Fife
Aberdeen
Shoreline
Centralia
Federal Way
Chehalis
Tumwater

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