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

American Airlines, at $562, 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 16% 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 Lufthansa. According to our data, you can fly for as low as $602. Users have also found prices from $711 and $1,273 on British Airways and Turkish Airlines, respectively.

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 $390). 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.

What is the cheapest day to fly from Basel EuroAirport Swiss to Seattle?

Travelers seeking maximum savings on their Basel EuroAirport Swiss to Seattle flight should consider departing on Monday mornings when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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.

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).

What is the cheapest month to fly from Basel EuroAirport Swiss to Seattle?

Due to multiple factors, expect to potentially pay more when booking in December. For low rates, April can be a great choice for travel to Seattle. Flights to Seattle from Basel EuroAirport Swiss in April are about $620 on average during April, but can be found for as low as $428.

What is the cheapest time of day to fly from BSL to SEA?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Basel EuroAirport Swiss to Seattle as you normally would.

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.

$385+ Flights from Basel EuroAirport Swiss to Seattle

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Cheap flight deals from Basel to Seattle

Round-trip from	$562 (American Airlines)
One-way from	$385 (Kiwi.com)
Popular in	July
Cheapest in	November
Average price	$1,188

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 ($208 potential increase over avg. RT price).

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Cheapest flight prices on average. 9% potential price decrease ($57 potential savings vs. average RT price).

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Average for round-trip flights in July 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 July 3, 2025.

Sat 10/46:35 amBSL - SEA

1 stop14h 00mBritish Airways

Sat 10/118:20 pmSEA - BSL

1 stop17h 30mBritish Airways

Deal found 7/1

$558

Mon 11/176:35 amBSL - SEA

1 stop19h 20mAmerican Airlines

Wed 12/1011:45 amSEA - BSL

2 stops21h 55mAmerican Airlines

Deal found 7/2

$562

Tue 10/146:45 amBSL - SEA

2 stops21h 42mMultiple Airlines

Mon 12/157:42 amSEA - BSL

2 stops21h 53mMultiple Airlines

Deal found 7/1

$577

Sat 8/236:15 amBSL - SEA

1 stop18h 40mDelta

Wed 9/249:40 amSEA - BSL

2 stops18h 30mDelta

Deal found 7/1

$583

Thu 11/208:15 pmBSL - SEA

1 stop26h 05mLufthansa

Wed 12/103:10 pmSEA - BSL

1 stop15h 50mLufthansa

Deal found 7/2

$646

Wed 8/69:45 amBSL - SEA

1 stop16h 14mUnited Airlines

Wed 8/206:50 pmSEA - BSL

1 stop29h 20mUnited Airlines

Deal found 7/1

$661

Wed 8/66:25 pmBSL - SEA

1 stop30h 30mKLM

Wed 8/201:30 pmSEA - BSL

1 stop14h 40mKLM

Deal found 7/2

$723

Sun 8/178:30 amBSL - SEA

2 stops19h 06mSWISS

Sun 8/2410:00 amSEA - BSL

2 stops36h 55mSWISS

Deal found 7/3

$1,116

Best flights from Basel to Seattle
Discover carefully curated flight deals from Basel to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 3, 2025.

Sat 8/236:35 amBSL - SEA

1 stop14h 00mAmerican Airlines

Wed 9/241:02 pmSEA - BSL

2 stops24h 38mAmerican Airlines

Deal found 7/3

$562

Sat 8/236:35 amBSL - SEA

2 stops35h 44mBritish Airways

Wed 9/243:00 pmSEA - BSL

2 stops19h 00mBritish Airways

Deal found 7/2

$571

Sat 8/236:15 amBSL - SEA

1 stop18h 40mDelta

Wed 9/249:40 amSEA - BSL

2 stops18h 30mDelta

Deal found 7/1

$583

Tue 7/228:10 pmBSL - SEA

1 stop29h 49mLufthansa

Sun 8/106:50 pmSEA - BSL

1 stop15h 45mLufthansa

Deal found 7/3

$651

Wed 8/69:45 amBSL - SEA

1 stop16h 14mUnited Airlines

Wed 8/206:50 pmSEA - BSL

1 stop29h 20mUnited Airlines

Deal found 7/1

$661

Tue 7/228:30 amBSL - SEA

2 stops22h 46mMultiple Airlines

Sun 8/102:55 pmSEA - BSL

2 stops19h 40mMultiple Airlines

Deal found 7/3

$684

Wed 8/66:25 pmBSL - SEA

1 stop30h 30mKLM

Wed 8/201:30 pmSEA - BSL

1 stop14h 40mKLM

Deal found 7/2

$723

Sun 8/178:30 amBSL - SEA

2 stops19h 06mSWISS

Sun 8/2410:00 amSEA - BSL

2 stops36h 55mSWISS

Deal found 7/3

$1,116

Last-minute flights from Basel to Seattle
Discover last-minute flight deals from Basel to Seattle. Data last updated July 3, 2025 and is based on user searches.

Tue 7/228:10 pmBSL - SEA

1 stop29h 49mLufthansa

Sun 8/106:50 pmSEA - BSL

1 stop15h 45mLufthansa

Deal found 7/3

$651

Tue 7/228:30 amBSL - SEA

2 stops22h 46mMultiple Airlines

Sun 8/102:55 pmSEA - BSL

2 stops19h 40mMultiple Airlines

Deal found 7/3

$684

Wed 8/69:45 amBSL - SEA

1 stop16h 14mUnited Airlines

Wed 8/206:50 pmSEA - BSL

1 stop29h 20mUnited Airlines

Deal found 7/1

$661

Wed 8/66:25 pmBSL - SEA

1 stop30h 30mKLM

Wed 8/201:30 pmSEA - BSL

1 stop14h 40mKLM

Deal found 7/2

$723

Sun 8/178:30 amBSL - SEA

2 stops19h 06mSWISS

Sun 8/2410:00 amSEA - BSL

2 stops36h 55mSWISS

Deal found 7/3

$1,116

Sat 8/236:35 amBSL - SEA

1 stop14h 00mAmerican Airlines

Wed 9/241:02 pmSEA - BSL

2 stops24h 38mAmerican Airlines

Deal found 7/3

$562

Sat 8/236:35 amBSL - SEA

2 stops35h 44mBritish Airways

Wed 9/243:00 pmSEA - BSL

2 stops19h 00mBritish Airways

Deal found 7/2

$571

Sat 8/236:15 amBSL - SEA

1 stop18h 40mDelta

Wed 9/249:40 amSEA - BSL

2 stops18h 30mDelta

Deal found 7/1

$583

One-way flights from Basel to Seattle
Search for one-way flight options from Basel to Seattle. Find affordable one-way fares based on user searches. Data last updated July 3, 2025.

Wed 9/106:00 amBSL - SEA

3 stops51h 30mMultiple Airlines

Deal found 7/2

$385

Wed 9/106:05 amBSL - SEA

1 stop14h 50mLufthansa

Deal found 7/2

$602

Tue 9/96:45 amBSL - SEA

1 stop13h 25mBritish Airways

Deal found 7/1

$711

Tue 7/86:55 pmBSL - SEA

1 stop31h 20mTurkish Airlines

Deal found 7/1

$1,273

Mon 7/76:15 amBSL - SEA

1 stop14h 20mDelta

Deal found 7/1

$1,641

Tue 7/89:45 amBSL - SEA

3 stops34h 03mUnited Airlines

Deal found 7/1

$1,782

Cheapflights Fare Finder

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

Sat 8/23

6:35 am-11:35 am

1 stop14h 00m

Seattle/Tacoma Intl

Wed 9/24

1:02 pm-10:40 pm

2 stops24h 38m

$562

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Sat 8/23

6:35 am-9:19 am

2 stops35h 44m

Seattle/Tacoma Intl

Wed 9/24

3:00 pm-7:00 pm

2 stops19h 00m

$571

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Sat 8/23

6:15 am-3:55 pm

1 stop18h 40m

Seattle/Tacoma Intl

Wed 9/24

9:40 am-1:10 pm

2 stops18h 30m

$583

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Tue 7/22

8:10 pm-4:59 pm

1 stop29h 49m

Seattle/Tacoma Intl

Sun 8/10

6:50 pm-7:35 pm

1 stop15h 45m

$651

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Wed 8/6

9:45 am-4:59 pm

1 stop16h 14m

Seattle/Tacoma Intl

Wed 8/20

6:50 pm-9:10 am

1 stop29h 20m

$661

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Tue 7/22

8:30 am-10:16 pm

2 stops22h 46m

Seattle/Tacoma Intl

Sun 8/10

2:55 pm-7:35 pm

2 stops19h 40m

$684

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Wed 8/6

6:25 pm-3:55 pm

1 stop30h 30m

Seattle/Tacoma Intl

Wed 8/20

1:30 pm-1:10 pm

1 stop14h 40m

$723

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Sun 8/17

8:30 am-6:36 pm

2 stops19h 06m

Seattle/Tacoma Intl

Sun 8/24

10:00 am-7:55 am

2 stops36h 55m

$1,116

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Wed 9/10

6:00 am-12:30 am

3 stops51h 30m

$385

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Wed 9/10

6:05 am-11:55 am

1 stop14h 50m

$602

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

Showing 1-10 of 14 results

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.

Reviews of airlines servicing Seattle

See what other customers who have flown with Delta, KLM, and SWISS from Basel EuroAirport Swiss to Seattle have to say. 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

7,982 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Delta

8.0

Very good

7,982 reviews

Delta

8.0

Very good

7,982 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

KLM

7.8

Good

1,367 reviews

Delta

8.0

Very good

7,982 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

SWISS

7.5

Good

1,654 reviews

Delta

8.0

Very good

7,982 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

United Airlines

7.4

Good

8,861 reviews

Delta

8.0

Very good

7,982 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Turkish Airlines

7.3

Good

3,895 reviews

Delta

8.0

Very good

7,982 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

What are the cheapest airlines flying from Basel EuroAirport Swiss to Seattle round-trip?
American Airlines, at $562, 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 16% 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 Lufthansa. According to our data, you can fly for as low as $602. Users have also found prices from $711 and $1,273 on British Airways and Turkish 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 $390). 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

SeaTac

Tukwila

Tacoma

Lakewood

Ocean Shores

Lacey

Leavenworth

Lynnwood

Renton

Olympia

Shoreline

Puyallup

Cle Elum

Centralia

Kent

Federal Way

Chehalis

Kirkland

Aberdeen

Shelton

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$385+ 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 9/10. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Basel to Seattle with Cheapflights

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2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Basel to Seattle

Round-trip from

One-way from

Popular in

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Find flight deals from Basel to Seattle

Cheapest flights from Basel to SeattleExplore 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 July 3, 2025.

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 July 3, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Basel EuroAirport Swiss to Seattle that are best for you.

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.

Reviews of airlines servicing Seattle

See what other customers who have flown with Delta, KLM, and SWISS from Basel EuroAirport Swiss to Seattle have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

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?

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

Can I find deals for flights from Basel to Seattle that include hotel bookings?

How can I find direct flights from Basel to Seattle?

Can I find deals for business class flights from Basel to Seattle?

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

Traveling to a place near Basel EuroAirport Swiss?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Basel to Seattle

See prices for flight routes from nearby airports that may be better suited for you.

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Travel Smart

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 July 3, 2025.