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$387+ Cheap flights from Seattle (SEA) to Basel (EAP)

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 12/2. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — EAP
Dec 20 — Dec 271
Sat 12/20
Sat 12/27
1 adult, Economy
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Cheap flight deals from Seattle to Basel

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Basel (EAP). 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 November 20, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$482
(Delta)

One-way from

$387
(Delta)

Popular in

December

Cheapest in

February

Average price

$588
Provider with most accurate pricing for Seattle/Tacoma Intl-Basel (EAP) flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Basel (EAP) flights.
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From Seattle/Tacoma Intl to Basel (EAP)
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One-way flight from Seattle/Tacoma Intl to Basel (EAP)
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Highest demand for flights based on searches. 5% potential increase in price ($37 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($24 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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Find flight deals from Seattle to Basel

Cheapest flights from Seattle to Basel
Explore the most affordable flight options available from Seattle to Basel. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 20, 2025.

This Air Canada deal was found by Cheapflights users on 11/18. 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.
Tue 12/28:10 amSEA - BSL
2 stops25h 20mMultiple Airlines
Wed 12/106:45 amBSL - SEA
2 stops24h 31mMultiple Airlines
Deal found 11/18$506
This Delta deal was found by Cheapflights users on 11/18. 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.
Tue 12/21:40 pmSEA - BSL
1 stop15h 10mDelta
Wed 12/1011:15 amBSL - SEA
1 stop33h 35mDelta
Deal found 11/18$581
This United Airlines deal was found by Cheapflights users on 11/18. 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 12/23:25 pmSEA - BSL
2 stops19h 15mUnited Airlines
Fri 12/129:50 amBSL - SEA
1 stop12h 30mUnited Airlines
Deal found 11/18$586
This Delta deal was found by Cheapflights users on 11/18. 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.
Wed 12/37:20 amSEA - BSL
2 stops18h 20mDelta
Mon 12/811:15 amBSL - SEA
1 stop33h 35mDelta
Deal found 11/18$592
This United Airlines deal was found by Cheapflights users on 11/18. 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 12/212:36 pmSEA - BSL
2 stops22h 04mUnited Airlines
Thu 12/119:50 amBSL - SEA
2 stops21h 26mUnited Airlines
Deal found 11/18$593
This United Airlines deal was found by Cheapflights users on 11/18. 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.
Mon 12/15:05 amSEA - BSL
2 stops29h 35mUnited Airlines
Fri 12/129:50 amBSL - SEA
1 stop12h 30mUnited Airlines
Deal found 11/18$595
This Delta deal was found by Cheapflights users on 11/18. 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.
Tue 12/21:40 pmSEA - BSL
1 stop15h 10mDelta
Tue 12/910:30 amBSL - SEA
2 stops32h 56mDelta
Deal found 11/18$597
This KAYAK deal was found by Cheapflights users on 11/18. 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.
Tue 12/22:00 pmSEA - BSL
1 stop19h 30mLufthansa
Fri 12/126:45 amBSL - SEA
1 stop14h 25mLufthansa
Deal found 11/18$598
This Delta deal was found by Cheapflights users on 11/18. 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.
Wed 12/37:20 amSEA - BSL
2 stops18h 20mDelta
Thu 12/116:05 amBSL - SEA
2 stops23h 30mDelta
Deal found 11/18$602
This KAYAK deal was found by Cheapflights users on 11/18. 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.
Wed 12/31:40 pmSEA - BSL
2 stops19h 50mLufthansa
Fri 12/126:45 amBSL - SEA
1 stop14h 25mLufthansa
Deal found 11/18$603

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Basel 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 November 20, 2025.
Use the filters below to find and compare flights from Seattle to Basel that are best for you.

Fly from

Seattle

Fly to

Basel

Route

Depart

Return

Price

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Wed 1/14

2:10 pm-9:50 am

1 stop34h 40m

Basel EuroAirport Swiss

Sun 1/18

11:15 am-11:50 am

1 stop33h 35m

$483

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Wed 1/14

3:10 pm-7:40 pm

1 stop19h 30m

Basel EuroAirport Swiss

Sun 1/18

9:50 am-7:16 pm

2 stops18h 26m

$484

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 12/2

1:40 pm-1:50 pm

1 stop15h 10m

Basel EuroAirport Swiss

Thu 12/11

6:05 am-11:50 am

1 stop14h 45m

$581

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 12/2

1:40 pm-1:50 pm

1 stop15h 10m

Basel EuroAirport Swiss

Wed 12/10

11:15 am-11:50 am

1 stop33h 35m

$581

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 12/2

1:40 pm-1:50 pm

1 stop15h 10m

Basel EuroAirport Swiss

Mon 12/8

11:15 am-11:50 am

1 stop33h 35m

$581

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 12/2

12:36 pm-7:40 pm

2 stops22h 04m

Basel EuroAirport Swiss

Thu 12/11

9:50 am-10:16 pm

2 stops21h 26m

$593

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 12/2

3:25 pm-7:40 pm

2 stops19h 15m

Basel EuroAirport Swiss

Tue 12/9

9:50 am-9:46 pm

2 stops20h 56m

$596

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 12/2

9:05 am-7:40 pm

2 stops25h 35m

Basel EuroAirport Swiss

Fri 12/12

9:50 am-6:32 pm

2 stops17h 42m

$596

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 12/2

1:40 pm-1:50 pm

1 stop15h 10m

$387

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 12/1

2:00 pm-6:20 pm

1 stop19h 20m

$388

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/18

Showing 1-10 of 17 results
1
2

Compare providers for flights from Seattle to Basel

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Basel in November.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Seattle-Basel flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Seattle-Basel flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Seattle-Basel flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Basel flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Basel flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Seattle to Basel

Have a flexible travel schedule? Discover the best time to fly to Basel from Seattle 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 Seattle to Basel

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

Currently, August is the cheapest month in which you can book a flight from Seattle to Basel (average of $385). Flying from Seattle to Basel in May is currently the most expensive (average of $817). 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 time of day to fly from SEA to EAP?

Find hourly flight availability from Seattle to Basel. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 20, 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 17% on flights from Seattle to Basel by exploring options for tickets in the evening.

How much does it cost to fly round-trip from Seattle to Basel?

Reviews of airlines servicing Basel

Get insights into the airlines that provide service to Basel. 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 Basel. Reviews last updated November 20, 2025.
Read through reviews of airlines operating flights from Seattle to Basel, such as Lufthansa and British Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Lufthansa
6.8
Okay
7,579 reviews

Overall

6.8

Entertainment

6.4

Boarding

7.0

Crew

7.6

Food

6.3

Comfort

6.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2024

SFO - FRA

Convenient flight to my destination. Good entertainment options on board. I was seated close to some people who had noisy children which made sleeping a bit challenging.
Lufthansa
6.8
Okay
7,579 reviews
Lufthansa
6.8
Okay
7,579 reviews

Overall

6.8

Entertainment

6.4

Boarding

7.0

Crew

7.6

Food

6.3

Comfort

6.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2024

SFO - FRA

Convenient flight to my destination. Good entertainment options on board. I was seated close to some people who had noisy children which made sleeping a bit challenging.
British Airways
6.7
Okay
7,533 reviews
Lufthansa
6.8
Okay
7,579 reviews

Overall

6.8

Entertainment

6.4

Boarding

7.0

Crew

7.6

Food

6.3

Comfort

6.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2024

SFO - FRA

Convenient flight to my destination. Good entertainment options on board. I was seated close to some people who had noisy children which made sleeping a bit challenging.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Basel. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Seattle to Basel?

    Departing from Seattle to Basel will take you 19h 30m. There are 5207 mi between Seattle and Basel. Both multi-stop and nonstop flights can be found to your destination and back.

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

    Our cheapest airline available from Seattle to Basel is British Airways. Our recent data shows that you can find tickets from as low as $481 on this airline. An additional option worth looking into is Lufthansa, starting at $497. British Airways is 26% cheaper than the average price of flights available within the next 90 days to this destination.

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

    Yes. In addition to deals on Seattle to Basel flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Basel?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Basel.

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

    Yes. Cheapflights offers flight deals from Seattle to Basel 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 Seattle to Basel?

    Currently, August is the cheapest month in which you can book a flight from Seattle to Basel (average of $385). Flying from Seattle to Basel in May is currently the most expensive (average of $817). 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

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.

Top 2 airlines flying from Seattle to Basel

Discover the top 2 airlines that operate flights from Seattle to Basel. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated November 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$481Average$694FlexibilityNo cancel feeOn-time70%
LufthansaCheapest$497Average$723FlexibilityNo cancel feeOn-time76%

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