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$345+ 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 2/4. Fares are subject to change and may not be available on all flights or dates of travel.
BSL — SEA
Dec 20 — Dec 271
Sat 12/20
Sat 12/27
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 20, 2025.

This American Airlines deal was found by Cheapflights users on 11/18. 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 12/46:05 amBSL - SEA
2 stops24h 45mAmerican Airlines
Mon 12/86:15 amSEA - BSL
2 stops23h 20mAmerican Airlines
Deal found 11/18$595
This Delta deal was found by Cheapflights users on 11/18. 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.
Thu 12/46:05 amBSL - SEA
1 stop14h 45mDelta
Mon 12/87:20 amSEA - BSL
2 stops21h 30mDelta
Deal found 11/18$605
This Flysmarter deal was found by Cheapflights users on 11/19. 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.
Sun 11/309:50 amBSL - SEA
2 stops32h 41mMultiple Airlines
Thu 12/48:00 pmSEA - BSL
2 stops35h 05mMultiple Airlines
Deal found 11/19$974
This Kiwi.com deal was found by Cheapflights users on 11/19. 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.
Sun 11/309:50 amBSL - SEA
2 stops18h 26mLufthansa
Wed 12/33:10 pmSEA - BSL
1 stop15h 55mLufthansa
Deal found 11/19$993
This CheapTickets.ch deal was found by Cheapflights users on 11/19. 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.
Sun 11/3011:20 amBSL - SEA
2 stops20h 58mBritish Airways
Thu 12/46:50 pmSEA - BSL
1 stop19h 00mBritish Airways
Deal found 11/19$1,026
This Expedia deal was found by Cheapflights users on 11/20. 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.
Sun 11/307:00 pmBSL - SEA
2 stops36h 06mMultiple Airlines
Fri 12/58:10 amSEA - BSL
2 stops26h 30mMultiple Airlines
Deal found 11/20$1,065
This United Airlines deal was found by Cheapflights users on 11/20. 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 11/301:10 pmBSL - SEA
2 stops56h 00mUnited Airlines
Fri 12/59:25 amSEA - BSL
2 stops25h 15mUnited Airlines
Deal found 11/20$1,137
This Flysmarter deal was found by Cheapflights users on 11/19. 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.
Sun 11/309:50 amBSL - SEA
2 stops21h 16mMultiple Airlines
Wed 12/35:50 amSEA - BSL
2 stops22h 45mMultiple Airlines
Deal found 11/19$1,139
This United Airlines deal was found by Cheapflights users on 11/19. 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.
Mon 12/299:50 amBSL - SEA
2 stops33h 06mUnited Airlines
Sun 1/43:10 pmSEA - BSL
1 stop12h 20mUnited Airlines
Deal found 11/19$1,184
This Air France deal was found by Cheapflights users on 11/19. 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.
Mon 12/295:55 pmBSL - SEA
1 stop26h 55mAir France
Sun 1/42:10 pmSEA - BSL
1 stop14h 40mAir France
Deal found 11/19$1,190

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 20, 2025.

Round-trip from

$583
(American Airlines)

One-way from

$345
(American Airlines)

Popular in

July

Cheapest in

November

Average price

$523
From Basel EuroAirport Swiss to Seattle/Tacoma Intl
Search Deals
One-way flight from Basel EuroAirport Swiss to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($100 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($21 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 20, 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 2/26

11:05 am-4:55 pm

1 stop14h 50m

Seattle/Tacoma Intl

Mon 3/2

6:50 pm-6:15 pm

1 stop14h 25m

$583

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

$586

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Tue 1/13

7:00 am-4:55 pm

1 stop18h 55m

Seattle/Tacoma Intl

Thu 1/29

6:50 pm-10:50 pm

1 stop19h 00m

$588

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Thu 1/15

6:05 am-4:55 pm

1 stop19h 50m

Seattle/Tacoma Intl

Wed 1/28

6:50 pm-6:40 pm

1 stop14h 50m

$588

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Thu 1/15

6:05 am-4:55 pm

1 stop19h 50m

Seattle/Tacoma Intl

Thu 1/29

7:00 am-3:05 pm

2 stops23h 05m

$588

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Mon 1/12

10:55 am-11:30 am

1 stop33h 35m

Seattle/Tacoma Intl

Sat 1/31

6:50 pm-10:10 am

1 stop30h 20m

$589

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Wed 1/14

6:20 am-8:45 pm

2 stops23h 25m

Seattle/Tacoma Intl

Thu 1/29

8:04 am-3:05 pm

2 stops22h 01m

$594

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Wed 2/4

6:20 am-10:07 pm

2 stops24h 47m

$351

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Wed 2/4

1:40 pm-10:33 am

3 stops53h 53m

$435

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Mon 12/1

9:40 pm-6:20 pm

2 stops53h 40m

$684

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/19

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 14h 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
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Tukwila
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Edmonds
Leavenworth
Renton
Kirkland
Lacey
Kent
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