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$488+ 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 4/10. Fares are subject to change and may not be available on all flights or dates of travel.
BSL — SEA
Mar 8 — Mar 151
Sat 3/8
Sat 3/15
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 March 3, 2025.

Round-trip from

$488
(American Airlines)

Popular in

July

Cheapest in

November

Average price

$584
From Basel EuroAirport Swiss to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 26% potential increase in price ($247 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($37 potential savings vs. average RT price).
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Average for round-trip flights in March 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 March 3, 2025.

This American Airlines deal was found by Cheapflights users on 3/3. 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 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 3/3$488
This British Airways deal was found by Cheapflights users on 3/3. 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 4/106:10 amBSL - SEA
1 stop14h 25mBritish Airways
Tue 4/221:30 pmSEA - BSL
1 stop24h 20mBritish Airways
Deal found 3/3$490
This Delta deal was found by Cheapflights users on 3/3. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/206:05 amBSL - SEA
1 stop14h 35mDelta
Mon 3/243:15 pmSEA - BSL
1 stop18h 10mDelta
Deal found 3/3$533
This Expedia deal was found by Cheapflights users on 3/3. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/56:15 amBSL - SEA
1 stop19h 40mMultiple Airlines
Wed 11/126:50 pmSEA - BSL
1 stop18h 15mMultiple Airlines
Deal found 3/3$538
This KLM deal was found by Cheapflights users on 3/2. 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.
Mon 3/316:15 amBSL - SEA
1 stop18h 45mKLM
Wed 4/236:10 pmSEA - BSL
1 stop30h 25mKLM
Deal found 3/2$543
This United Airlines deal was found by Cheapflights users on 3/2. 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 4/111:25 amBSL - SEA
2 stops43h 16mUnited Airlines
Thu 4/2412:54 pmSEA - BSL
2 stops21h 41mUnited Airlines
Deal found 3/2$567
This flygcity.se deal was found by Cheapflights users on 3/3. 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 flygcity.se is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/176:05 amBSL - SEA
2 stops21h 56mLufthansa
Thu 4/242:15 pmSEA - BSL
1 stop14h 25mLufthansa
Deal found 3/3$584
This Austrian Airlines deal was found by Cheapflights users on 3/2. 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 Austrian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/168:25 pmBSL - SEA
2 stops31h 36mAustrian Airlines
Wed 4/238:15 amSEA - BSL
2 stops26h 30mAustrian Airlines
Deal found 3/2$1,216
This CheapTickets.ch deal was found by Cheapflights users on 3/3. 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 CheapTickets.ch is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/2610:35 amBSL - SEA
1 stop33h 00mTurkish Airlines
Fri 10/177:10 pmSEA - BSL
1 stop37h 50mTurkish Airlines
Deal found 3/3$3,845

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 March 3, 2025.

Fly from

Basel

Fly to

Seattle

Route

Depart

Return

Price

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

$488

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

1:30 pm-10:50 pm

1 stop24h 20m

$490

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Thu 3/20

6:05 am-12:40 pm

1 stop14h 35m

Seattle/Tacoma Intl

Mon 3/24

3:15 pm-5:25 pm

1 stop18h 10m

$533

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Tue 4/1

6:45 am-11:10 am

1 stop13h 25m

Seattle/Tacoma Intl

Tue 4/8

1:35 pm-3:05 pm

2 stops16h 30m

$540

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Mon 3/31

6:15 am-4:00 pm

1 stop18h 45m

Seattle/Tacoma Intl

Wed 4/23

6:10 pm-9:35 am

1 stop30h 25m

$543

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Tue 4/1

11:25 am-9:41 pm

2 stops43h 16m

Seattle/Tacoma Intl

Thu 4/24

12:54 pm-7:35 pm

2 stops21h 41m

$567

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Thu 4/17

6:05 am-7:01 pm

2 stops21h 56m

Seattle/Tacoma Intl

Thu 4/24

2:15 pm-1:40 pm

1 stop14h 25m

$584

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Wed 4/16

8:25 pm-7:01 pm

2 stops31h 36m

Seattle/Tacoma Intl

Wed 4/23

8:15 am-7:45 pm

2 stops26h 30m

$1,216

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-9:40 am

1 stop29h 30m

$4,668

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Sun 6/1

7:05 am-11:30 am

1 stop13h 25m

$627

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/3

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.

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 March 3, 2025.
Delta
8.0
Very good
8,068 reviews

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Comfort

8.0

Crew

8.5

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
8,068 reviews
Delta
8.0
Very good
8,068 reviews

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Comfort

8.0

Crew

8.5

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
8,068 reviews

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Comfort

8.0

Crew

8.5

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

Austrian Airlines
7.6
Good
768 reviews
Delta
8.0
Very good
8,068 reviews

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Comfort

8.0

Crew

8.5

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
8,679 reviews
Delta
8.0
Very good
8,068 reviews

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Comfort

8.0

Crew

8.5

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
3,796 reviews
Delta
8.0
Very good
8,068 reviews

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Comfort

8.0

Crew

8.5

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?

    American Airlines, at $488, was found to be the cheapest airline from Basel EuroAirport Swiss to Seattle.Alternate airlines to your destination round-trip include British Airways and Delta. American Airlines is priced at 29% 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 $675. Users have also found prices from $817 and $948 on KLM 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
Renton
Lacey
Ocean Shores
Tacoma
Leavenworth
Federal Way
Centralia
Olympia
Cle Elum
Lakewood
Mukilteo
Aberdeen
Issaquah
Shoreline
Lynnwood
Shelton
Silverdale
Redmond

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Alternative routes for Basel to Seattle

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