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$473+ 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 3/14. Fares are subject to change and may not be available on all flights or dates of travel.
BSL — SEA
Feb 4 — Feb 111
Tue 2/4
Tue 2/11
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 30, 2025.

Round-trip from

$473
(Booking.com)

Popular in

July

Cheapest in

January

Average price

$422
From Basel EuroAirport Swiss to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 18% potential increase in price ($144 potential increase over avg. RT price).
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Cheapest flight prices on average. 6% potential price decrease ($36 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2025
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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 30, 2025.

This Booking.com deal was found by Cheapflights users on 1/30. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/146:40 amBSL - SEA
1 stop19h 15mBritish Airways
Mon 3/177:50 pmSEA - BSL
1 stop14h 20mBritish Airways
Deal found 1/30$473
This Billigflug deal was found by Cheapflights users on 1/30. 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 Billigflug is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/164:20 pmBSL - SEA
2 stops38h 47mMultiple Airlines
Sun 3/2311:55 amSEA - BSL
2 stops23h 05mMultiple Airlines
Deal found 1/30$482
This American Airlines deal was found by Cheapflights users on 1/29. 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 4/106:10 amBSL - SEA
1 stop14h 25mAmerican Airlines
Tue 4/2211:20 amSEA - BSL
2 stops26h 30mAmerican Airlines
Deal found 1/29$498
This KLM deal was found by Cheapflights users on 1/30. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/146:05 amBSL - SEA
2 stops17h 04mKLM
Mon 3/1711:15 amSEA - BSL
2 stops15h 25mKLM
Deal found 1/30$538
This United Airlines deal was found by Cheapflights users on 1/30. 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.
Thu 4/1011:30 amBSL - SEA
2 stops42h 56mUnited Airlines
Tue 4/227:15 amSEA - BSL
2 stops27h 20mUnited Airlines
Deal found 1/30$566
This Air Canada deal was found by Cheapflights users on 1/29. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/256:05 amBSL - SEA
2 stops25h 11mAir Canada
Mon 7/75:45 amSEA - BSL
2 stops22h 55mAir Canada
Deal found 1/29$601
This Delta deal was found by Cheapflights users on 1/29. 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.
Sat 5/176:15 amBSL - SEA
2 stops19h 02mDelta
Sat 5/318:50 amSEA - BSL
2 stops20h 00mDelta
Deal found 1/29$616
This Lufthansa deal was found by Cheapflights users on 1/29. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/251:00 pmBSL - SEA
1 stop12h 59mLufthansa
Mon 7/72:20 pmSEA - BSL
2 stops20h 15mLufthansa
Deal found 1/29$656
This KAYAK deal was found by Cheapflights users on 1/29. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/176:55 pmBSL - SEA
1 stop31h 15mTurkish Airlines
Sat 5/317:05 pmSEA - BSL
1 stop29h 35mTurkish Airlines
Deal found 1/29$4,667

Find flights from Basel to Seattle within your budget

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 30, 2025.

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Fly to

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Route

Depart

Return

Price

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Fri 3/14

6:40 am-5:55 pm

1 stop19h 15m

Seattle/Tacoma Intl

Mon 3/17

7:50 pm-6:10 pm

1 stop14h 20m

$473

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Sun 3/16

4:20 pm-11:07 pm

2 stops38h 47m

Seattle/Tacoma Intl

Sun 3/23

11:55 am-7:00 pm

2 stops23h 05m

$482

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Thu 4/10

6:10 am-11:35 am

1 stop14h 25m

Seattle/Tacoma Intl

Tue 4/22

11:20 am-10:50 pm

2 stops26h 30m

$498

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Fri 3/14

6:05 am-3:09 pm

2 stops17h 04m

Seattle/Tacoma Intl

Mon 3/17

11:15 am-10:40 am

2 stops15h 25m

$538

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Thu 4/10

11:30 am-9:26 pm

2 stops42h 56m

Seattle/Tacoma Intl

Tue 4/22

7:15 am-7:35 pm

2 stops27h 20m

$566

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Wed 6/25

6:05 am-10:16 pm

2 stops25h 11m

Seattle/Tacoma Intl

Mon 7/7

5:45 am-1:40 pm

2 stops22h 55m

$601

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Sat 5/17

6:15 am-4:17 pm

2 stops19h 02m

Seattle/Tacoma Intl

Sat 5/31

8:50 am-1:50 pm

2 stops20h 00m

$616

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Wed 6/25

1:00 pm-4:59 pm

1 stop12h 59m

Seattle/Tacoma Intl

Mon 7/7

2:20 pm-7:35 pm

2 stops20h 15m

$656

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Sat 5/17

6:55 pm-5:10 pm

1 stop31h 15m

Seattle/Tacoma Intl

Sat 5/31

7:05 pm-9:40 am

1 stop29h 35m

$4,667

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Sun 2/23

6:45 pm-5:00 pm

3 stops55h 15m

$566

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/29

Showing 1-10 of 13 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.

Travel insights for flights from Basel to Seattle

Get recent, data-driven insights about flights from Basel to Seattle including ideal travel times, pricing trends, and more.

Rainfall in Seattle by month

Plan your trip to Seattle by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Seattle ranges from 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit Seattle when rainfall is around 0.7 in.

Temperature in Seattle by month

Plan your trip to Seattle by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Seattle, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated January 30, 2025.
To help decide which airline to fly from Basel to Seattle, see what other customers have to say about Delta, KLM and United Airlines. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
8,454 reviews

Crew

8.5

Food

7.3

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Delta
8.0
Very good
8,454 reviews
Delta
8.0
Very good
8,454 reviews

Crew

8.5

Food

7.3

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

KLM
7.8
Good
1,335 reviews
Delta
8.0
Very good
8,454 reviews

Crew

8.5

Food

7.3

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

United Airlines
7.4
Good
8,913 reviews
Delta
8.0
Very good
8,454 reviews

Crew

8.5

Food

7.3

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Turkish Airlines
7.3
Good
3,904 reviews
Delta
8.0
Very good
8,454 reviews

Crew

8.5

Food

7.3

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
8,454 reviews

Crew

8.5

Food

7.3

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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.

  • What are the cheapest airlines flying from Basel EuroAirport Swiss to Seattle round-trip?

    British Airways, at $473, was found to be the cheapest airline from Basel EuroAirport Swiss to Seattle.Alternate airlines to your destination round-trip include American Airlines and KLM.

  • What are the cheapest airlines to fly from Basel EuroAirport Swiss to Seattle one-way?

    For one-way options, check prices for American Airlines. According to our data, you can fly for as low as $651. Users have also found prices from $722 and $1,671 on British Airways and United Airlines, respectively.

  • 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.

  • What is the cheapest month to book a flight from Basel EuroAirport Swiss to Seattle?

    Currently, January is the cheapest month in which you can book a flight from Basel EuroAirport Swiss to Seattle (average of $238). Flying from Basel EuroAirport Swiss to Seattle in July is currently the most expensive (average of $411). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Basel EuroAirport Swiss?

Book flights to Basel EuroAirport Swiss if you plan to visit one of these locations
SeaTac
Tukwila
Renton
Tacoma
Lacey
Federal Way
Ocean Shores
Leavenworth
Olympia
Marysville
Centralia
Cle Elum
Mukilteo
Aberdeen
Lakewood
Issaquah
Shoreline
Lynnwood
Shelton
Silverdale

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Alternative routes for Basel to Seattle

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