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Cheap flights from Basel EuroAirport Swiss to Seattle from $561

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Basel EuroAirport Swiss to Seattle departing on 2/19. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap round-trip flights

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American Airlines Logo
6:05 am - 4:55 pmBSL-SEA
19h 50m1 stop
American Airlines Logo
6:50 pm - 6:15 pmSEA-BSL
14h 25m1 stop
$561American Airlines
Find Deal
Thu, Feb 19 - Mon, Mar 2
American Airlines Logo
11:05 am - 11:30 amBSL-SEA
33h 25m1 stop
American Airlines Logo
1:34 pm - 6:15 pmSEA-BSL
19h 41m2 stops
$562American Airlines
Find Deal
Thu, Feb 19 - Mon, Mar 2
American Airlines Logo
11:05 am - 11:07 pmBSL-SEA
21h 02m2 stops
American Airlines Logo
1:34 pm - 6:15 pmSEA-BSL
19h 41m2 stops
$567American Airlines
Find Deal
Thu, Feb 19 - Mon, Mar 2
United Airlines Logo
9:50 am - 11:04 pmBSL-SEA
22h 14m2 stops
United Airlines Logo
5:00 am - 7:40 pmSEA-BSL
30h 40m2 stops
$664United Airlines
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Thu, Mar 5 - Thu, Mar 26
Delta Logo
6:05 am - 11:35 amBSL-SEA
14h 30m1 stop
Delta Logo
7:20 am - 10:40 amSEA-BSL
19h 20m2 stops
$687Delta
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Thu, Mar 5 - Thu, Mar 26
United Airlines Logo
9:50 am - 11:22 pmBSL-SEA
46h 32m3 stops
United Airlines Logo
9:19 am - 12:30 pmSEA-BSL
19h 11m2 stops
$718United Airlines
Find Deal
Thu, Mar 5 - Thu, Mar 26
Delta Logo
6:05 am - 6:26 pmBSL-SEA
21h 21m2 stops
Delta Logo
2:10 pm - 1:50 pmSEA-BSL
14h 40m1 stop
$979Delta
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Mon, Dec 29 - Sun, Jan 4
Air France Logo
5:55 pm - 11:50 amBSL-SEA
26h 55m1 stop
Air France Logo
2:10 pm - 1:50 pmSEA-BSL
14h 40m1 stop
$1,000Air France
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Mon, Dec 29 - Sun, Jan 4
Multiple Airlines Logo
11:10 am - 6:48 pmBSL-SEA
16h 38m2 stops
Multiple Airlines Logo
8:04 am - 10:15 amSEA-BSL
17h 11m2 stops
$1,132Multiple Airlines
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Wed, Nov 19 - Tue, Nov 25
Multiple Airlines Logo
10:55 am - 5:05 pmBSL-SEA
39h 10m1 stop
Multiple Airlines Logo
12:25 am - 10:00 amSEA-BSL
24h 35m2 stops
$1,761Multiple Airlines
Find Deal
Mon, Dec 29 - Sat, Jan 3

American Airlines flights from Basel EuroAirport Swiss to Seattle

Our best American Airlines deals on Basel EuroAirport Swiss to Seattle flight tickets
American Airlines
Feb 19
BSL6:05 amBasel EuroAirport Swiss
19h 50m
1 stop
SEA4:55 pmSeattle/Tacoma Intl
Mar 2
SEA6:50 pmSeattle/Tacoma Intl
14h 25m
1 stop
BSL6:15 pmBasel EuroAirport Swiss
$561
Find similar
American Airlines
Feb 19
BSL11:05 amBasel EuroAirport Swiss
33h 25m
1 stop
SEA11:30 amSeattle/Tacoma Intl
Mar 2
SEA1:34 pmSeattle/Tacoma Intl
19h 41m
2 stops
BSL6:15 pmBasel EuroAirport Swiss
$562
Find similar
American Airlines
Feb 19
BSL11:05 amBasel EuroAirport Swiss
21h 02m
2 stops
SEA11:07 pmSeattle/Tacoma Intl
Mar 2
SEA1:34 pmSeattle/Tacoma Intl
19h 41m
2 stops
BSL6:15 pmBasel EuroAirport Swiss
$567
Find similar

United Airlines flights from Basel EuroAirport Swiss to Seattle

Our best United Airlines deals on Basel EuroAirport Swiss to Seattle flight tickets
United Airlines
Mar 5
BSL9:50 amBasel EuroAirport Swiss
22h 14m
2 stops
SEA11:04 pmSeattle/Tacoma Intl
Mar 26
SEA5:00 amSeattle/Tacoma Intl
30h 40m
2 stops
BSL7:40 pmBasel EuroAirport Swiss
$664
Find similar
United Airlines
Mar 5
BSL9:50 amBasel EuroAirport Swiss
46h 32m
3 stops
SEA11:22 pmSeattle/Tacoma Intl
Mar 26
SEA9:19 amSeattle/Tacoma Intl
19h 11m
2 stops
BSL12:30 pmBasel EuroAirport Swiss
$718
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Basel EuroAirport Swiss 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, momondo users made 832,500 searches. Data last updated October 14, 2025.
Use the filters below to find and compare flights from Basel EuroAirport Swiss to Seattle that are best for you.

Fly from

Fly to

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

$561

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Thu 2/19

11:05 am-11:30 am

1 stop33h 25m

Seattle/Tacoma Intl

Mon 3/2

1:34 pm-6:15 pm

2 stops19h 41m

$562

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Thu 2/19

11:05 am-11:07 pm

2 stops21h 02m

Seattle/Tacoma Intl

Mon 3/2

1:34 pm-6:15 pm

2 stops19h 41m

$567

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Thu 3/5

9:50 am-11:04 pm

2 stops22h 14m

Seattle/Tacoma Intl

Thu 3/26

5:00 am-7:40 pm

2 stops30h 40m

$664

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Thu 3/5

6:05 am-11:35 am

1 stop14h 30m

Seattle/Tacoma Intl

Thu 3/26

7:20 am-10:40 am

2 stops19h 20m

$687

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Thu 3/5

9:50 am-11:22 pm

3 stops46h 32m

Seattle/Tacoma Intl

Thu 3/26

9:19 am-12:30 pm

2 stops19h 11m

$718

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Mon 12/29

6:05 am-6:26 pm

2 stops21h 21m

Seattle/Tacoma Intl

Sun 1/4

2:10 pm-1:50 pm

1 stop14h 40m

$979

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Mon 12/29

5:55 pm-11:50 am

1 stop26h 55m

Seattle/Tacoma Intl

Sun 1/4

2:10 pm-1:50 pm

1 stop14h 40m

$1,000

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Wed 11/19

11:10 am-6:48 pm

2 stops16h 38m

Seattle/Tacoma Intl

Tue 11/25

8:04 am-10:15 am

2 stops17h 11m

$1,132

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Mon 12/29

10:55 am-5:05 pm

1 stop39h 10m

Seattle/Tacoma Intl

Sat 1/3

12:25 am-10:00 am

2 stops24h 35m

$1,761

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 resultsSorted by cheapest first
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How to get the cheapest flight ticket from Basel EuroAirport Swiss to Seattle

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Seattle?

On average, the least expensive day to fly to Seattle from Basel EuroAirport Swiss is on a Thursday. momondo users have found tickets for Thursday departures for as low as $547. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Monday is the most expensive day to depart from Basel EuroAirport Swiss because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $1,021.

When to book flights from Basel EuroAirport Swiss to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from Basel EuroAirport Swiss to Seattle according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Basel EuroAirport Swiss to Seattle (BSL to SEA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Basel EuroAirport Swiss to Seattle

Direct flights

None
There are no direct flights from Basel EuroAirport Swiss to Seattle. There are no popular flight routes from Basel EuroAirport Swiss to Seattle.
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  • How far is Basel EuroAirport Swiss to Seattle/Tacoma Intl by plane?

    The straight-line distance from Basel EuroAirport Swiss to Seattle/Tacoma Intl is 5198.6 mi. 12h 30m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Basel EuroAirport Swiss to Seattle/Tacoma Intl Airport?

    Prices for flights from Basel EuroAirport Swiss to Seattle/Tacoma Intl Airport refresh daily.

  • How old do you have to be to fly from Basel EuroAirport Swiss to Seattle/Tacoma Intl Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Basel EuroAirport Swiss to Seattle/Tacoma Intl Airport.

  • What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

    The necessary travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Tacoma
Leavenworth
SeaTac
Ocean Shores
Renton
Olympia
Lynnwood
Kent
Marysville
Puyallup
Federal Way
Tukwila
Kirkland
Fife
Centralia
Lakewood
Shoreline
Cle Elum
Redmond
Westport

Why use momondo?

Why should I use momondo to find a flight deal from Basel to Seattle?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Seattle from Basel.

Can I find flights from Basel to Seattle with flexible booking policies on momondo?

Yes. All flights to Seattle from Basel on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Basel to Seattle?

momondo provides multiple filters to help you find the best flight to Seattle from Basel. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Basel to Seattle right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Basel to Seattle flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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