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$468+ 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 6/29. Fares are subject to change and may not be available on all flights or dates of travel.
BSL — SEA
Apr 8 — Apr 151
Tue 4/8
Tue 4/15
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 April 3, 2025.

Round-trip from

$515
(Delta)

One-way from

$468
(Kiwi.com)

Popular in

July

Cheapest in

November

Average price

$611
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. 23% potential increase in price ($215 potential increase over avg. RT price).
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Cheapest flight prices on average. 6% potential price decrease ($43 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 3, 2025.

This Finnair deal was found by Cheapflights users on 4/2. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/106:10 amBSL - SEA
1 stop21h 10mMultiple Airlines
Tue 4/151:30 pmSEA - BSL
1 stop16h 35mMultiple Airlines
Deal found 4/2$490
This British Airways deal was found by Cheapflights users on 4/3. 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 4/105:10 pmBSL - SEA
1 stop27h 25mBritish Airways
Tue 4/221:30 pmSEA - BSL
1 stop20h 00mBritish Airways
Deal found 4/3$501
This American Airlines deal was found by Cheapflights users on 4/2. 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 4/1012:15 pmBSL - SEA
2 stops19h 54mAmerican Airlines
Tue 4/151:35 pmSEA - BSL
2 stops16h 30mAmerican Airlines
Deal found 4/2$514
This Delta deal was found by Cheapflights users on 4/2. 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.
Fri 5/306:15 amBSL - SEA
2 stops18h 53mDelta
Fri 6/61:30 pmSEA - BSL
1 stop15h 40mDelta
Deal found 4/2$515
This KLM deal was found by Cheapflights users on 4/2. 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.
Sat 5/176:25 pmBSL - SEA
1 stop26h 15mKLM
Sat 5/312:10 pmSEA - BSL
1 stop34h 25mKLM
Deal found 4/2$539
This Lufthansa deal was found by Cheapflights users on 4/2. 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.
Fri 5/309:45 amBSL - SEA
1 stop16h 14mLufthansa
Fri 6/62:15 pmSEA - BSL
1 stop14h 30mLufthansa
Deal found 4/2$587
This United Airlines deal was found by Cheapflights users on 4/2. 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.
Tue 12/29:35 amBSL - SEA
1 stop12h 45mUnited Airlines
Thu 12/112:00 pmSEA - BSL
1 stop19h 10mUnited Airlines
Deal found 4/2$636
This KAYAK deal was found by Cheapflights users on 4/2. 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 20mTurkish Airlines
Sat 5/317:10 pmSEA - BSL
1 stop37h 50mTurkish Airlines
Deal found 4/2$4,373

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 April 3, 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

Fri 5/30

6:15 am-4:08 pm

2 stops18h 53m

Seattle/Tacoma Intl

Fri 6/6

1:30 pm-2:10 pm

1 stop15h 40m

$515

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Sat 5/17

6:25 pm-11:40 am

1 stop26h 15m

Seattle/Tacoma Intl

Sat 5/31

2:10 pm-9:35 am

1 stop34h 25m

$539

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Fri 5/30

9:45 am-4:59 pm

1 stop16h 14m

Seattle/Tacoma Intl

Fri 6/6

2:15 pm-1:45 pm

1 stop14h 30m

$587

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Wed 8/6

7:15 pm-11:35 am

1 stop25h 20m

Seattle/Tacoma Intl

Wed 8/20

3:13 pm-7:00 pm

2 stops18h 47m

$652

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Wed 8/6

6:40 am-8:04 pm

2 stops22h 24m

Seattle/Tacoma Intl

Wed 8/20

1:29 pm-10:40 pm

2 stops24h 11m

$656

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Sat 5/17

6:35 am-11:35 am

1 stop14h 00m

Seattle/Tacoma Intl

Sat 5/31

1:35 pm-5:40 pm

1 stop19h 05m

$662

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Wed 8/6

1:00 pm-10:59 pm

2 stops18h 59m

Seattle/Tacoma Intl

Wed 8/20

7:34 pm-9:10 am

3 stops52h 36m

$710

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Sat 5/17

6:55 pm-5:15 pm

1 stop31h 20m

Seattle/Tacoma Intl

Sat 5/31

7:10 pm-6:00 pm

1 stop37h 50m

$4,373

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Sun 6/29

2:35 pm-12:58 pm

3 stops31h 23m

$468

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Tue 5/6

6:45 am-11:10 am

1 stop13h 25m

$627

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/1

Showing 1-10 of 13 results
1
2

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.

Cheapflights Insights

Everything you need to know about your flight from Basel EuroAirport Swiss to Seattle

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 April 3, 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
7,897 reviews

Comfort

7.9

Overall

8.0

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

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
7,897 reviews
Delta
8.0
Very good
7,897 reviews

Comfort

7.9

Overall

8.0

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

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
1,323 reviews
Delta
8.0
Very good
7,897 reviews

Comfort

7.9

Overall

8.0

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

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
8,616 reviews
Delta
8.0
Very good
7,897 reviews

Comfort

7.9

Overall

8.0

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

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
3,750 reviews
Delta
8.0
Very good
7,897 reviews

Comfort

7.9

Overall

8.0

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

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
7,897 reviews

Comfort

7.9

Overall

8.0

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

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?

    Delta, at $515, was found to be the cheapest airline from Basel EuroAirport Swiss to Seattle.Alternate airlines to your destination round-trip include KLM and Lufthansa. Delta is priced at 27% lower than the current average price of a flight leaving 3 months from now.

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

    For one-way options, check prices for British Airways. According to our data, you can fly for as low as $627. Users have also found prices from $801 and $827 on Lufthansa and Delta, 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
Tacoma
Lakewood
Renton
Lacey
Ocean Shores
Leavenworth
Federal Way
Olympia
Cle Elum
Centralia
Mukilteo
Aberdeen
Shoreline
Lynnwood
Shelton
Silverdale
Redmond
Monroe

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Alternative routes for Basel to Seattle

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