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$522+ Cheap flights from Basel EuroAirport Swiss (BSL) to Seattle (SEA)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/28. Fares are subject to change and may not be available on all flights or dates of travel.
BSL — SEA
Feb 17 — Feb 241
Tue 2/17
Tue 2/24
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 18, 2026.

Round-trip from

$526
(American Airlines)

One-way from

$525
(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 18, 2026.

This American Airlines deal was found by Cheapflights users on 1/15. 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 am
BSL
-
SEA
1 stop14h 35m
American Airlines
Tue 9/17:10 am
SEA
-
BSL
2 stops26h 20m
American Airlines
Deal found 1/15$522
This Iberia deal was found by Cheapflights users on 1/16. 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 2/1211:05 am
BSL
-
SEA
2 stops22h 19m
Multiple Airlines
Tue 2/177:15 am
SEA
-
BSL
2 stops22h 50m
Multiple Airlines
Deal found 1/16$529
This Iberia deal was found by Cheapflights users on 1/17. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/196:05 am
BSL
-
SEA
1 stop19h 50m
Multiple Airlines
Mon 3/27:15 am
SEA
-
BSL
2 stops26h 00m
Multiple Airlines
Deal found 1/17$533
This Iberia deal was found by Cheapflights users on 1/16. 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.
Fri 2/137:00 am
BSL
-
SEA
1 stop13h 30m
Multiple Airlines
Tue 2/177:15 am
SEA
-
BSL
2 stops22h 50m
Multiple Airlines
Deal found 1/16$534
This British Airways deal was found by Cheapflights users on 1/16. 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 am
BSL
-
SEA
1 stop19h 50m
British Airways
Mon 3/26:50 pm
SEA
-
BSL
1 stop17h 45m
British Airways
Deal found 1/16$544
This British Airways deal was found by Cheapflights users on 1/17. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/286:00 am
BSL
-
SEA
1 stop14h 35m
British Airways
Tue 9/18:20 pm
SEA
-
BSL
1 stop17h 30m
British Airways
Deal found 1/17$569
This lastminute.com deal was found by Cheapflights users on 1/16. 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 lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/137:00 am
BSL
-
SEA
2 stops26h 24m
British Airways
Tue 2/177:15 am
SEA
-
BSL
2 stops22h 50m
British Airways
Deal found 1/16$574
This Air France deal was found by Cheapflights users on 1/16. 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.
Fri 2/1311:15 am
BSL
-
SEA
1 stop33h 25m
Air France
Tue 2/171:40 pm
SEA
-
BSL
1 stop15h 10m
Air France
Deal found 1/16$582

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 18, 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-7:14 pm

2 stops22h 09m

Seattle/Tacoma Intl

Mon 3/2

10:08 pm-3:05 pm

2 stops31h 57m

$526

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

7:15 am-6:15 pm

2 stops26h 00m

$533

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-9:35 pm

1 stop17h 45m

$544

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Fri 2/13

11:15 am-11:40 am

1 stop33h 25m

Seattle/Tacoma Intl

Tue 2/17

1:40 pm-1:50 pm

1 stop15h 10m

$582

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Thu 2/12

6:05 am-11:40 am

1 stop14h 35m

Seattle/Tacoma Intl

Tue 2/17

1:40 pm-1:50 pm

1 stop15h 10m

$583

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Mon 7/6

8:15 pm-4:59 pm

1 stop29h 44m

Seattle/Tacoma Intl

Sat 7/18

6:50 pm-7:50 pm

1 stop16h 00m

$702

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Mon 7/6

8:15 pm-4:59 pm

1 stop29h 44m

Seattle/Tacoma Intl

Thu 7/16

6:50 pm-7:40 pm

1 stop15h 50m

$702

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Mon 7/6

8:20 am-12:45 am

2 stops25h 25m

Seattle/Tacoma Intl

Wed 7/15

6:50 pm-7:40 pm

1 stop15h 50m

$730

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Mon 7/6

8:20 am-12:45 am

2 stops25h 25m

Seattle/Tacoma Intl

Thu 7/16

6:50 pm-7:40 pm

1 stop15h 50m

$730

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Mon 7/6

8:20 am-11:55 am

1 stop12h 35m

Seattle/Tacoma Intl

Fri 7/17

11:20 pm-7:45 am

2 stops23h 25m

$731

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/18

Showing 1-10 of 19 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. 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?

Book flights to Seattle if you plan to visit one of these locations
Tacoma
SeaTac
Lakewood
Ocean Shores
Olympia
Lynnwood
Lacey
Edmonds
Renton
Puyallup
Kirkland
Kent
Tukwila
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Fife
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Shoreline
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Federal Way
Chehalis

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