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Basel

$288+ 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 2/18. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — EAP
Feb 20 — Feb 271
Fri 2/20
Fri 2/27
1 adult, Economy
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Cheap 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 January 21, 2026.

This Mytrip deal was found by Cheapflights users on 1/20. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/58:10 am
SEA
-
BSL
2 stops20h 35m
Multiple Airlines
Thu 3/126:35 am
BSL
-
SEA
1 stop14h 35m
Multiple Airlines
Deal found 1/20$479
This KLM deal was found by Cheapflights users on 1/19. 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.
Tue 2/241:40 pm
SEA
-
BSL
1 stop15h 10m
KLM
Fri 3/66:05 am
BSL
-
SEA
1 stop14h 30m
KLM
Deal found 1/19$482
This oojo deal was found by Cheapflights users on 1/19. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/247:15 am
SEA
-
BSL
2 stops30h 05m
British Airways
Fri 3/63:55 pm
BSL
-
SEA
2 stops41h 29m
British Airways
Deal found 1/19$485
This oojo deal was found by Cheapflights users on 1/21. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/267:15 am
SEA
-
BSL
2 stops26h 50m
British Airways
Sun 3/16:50 pm
BSL
-
SEA
2 stops37h 14m
British Airways
Deal found 1/21$486
This Delta deal was found by Cheapflights users on 1/21. 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 2/198:30 am
SEA
-
BSL
2 stops20h 20m
Delta
Wed 3/46:05 am
BSL
-
SEA
1 stop14h 30m
Delta
Deal found 1/21$487
This KLM deal was found by Cheapflights users on 1/21. 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.
Thu 2/263:05 pm
SEA
-
BSL
1 stop34h 35m
KLM
Sun 3/15:55 pm
BSL
-
SEA
1 stop26h 40m
KLM
Deal found 1/21$488
This Cheapflightsfares deal was found by Cheapflights users on 1/19. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/66:50 pm
SEA
-
BSL
1 stop13h 15m
British Airways
Fri 3/137:00 am
BSL
-
SEA
1 stop13h 30m
British Airways
Deal found 1/19$490
This Air France deal was found by Cheapflights users on 1/21. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/198:05 am
SEA
-
BSL
2 stops17h 35m
Multiple Airlines
Wed 3/46:05 am
BSL
-
SEA
2 stops17h 39m
Multiple Airlines
Deal found 1/21$497
This Air France deal was found by Cheapflights users on 1/20. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/73:05 pm
SEA
-
BSL
1 stop17h 20m
Multiple Airlines
Sat 3/146:05 am
BSL
-
SEA
2 stops19h 04m
Multiple Airlines
Deal found 1/20$498
This United Airlines deal was found by Cheapflights users on 1/20. 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 3/58:00 am
SEA
-
BSL
2 stops26h 40m
United Airlines
Thu 3/129:50 am
BSL
-
SEA
2 stops23h 09m
United Airlines
Deal found 1/20$499
This FlightHub deal was found by Cheapflights users on 1/20. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/156:50 pm
SEA
-
BSL
1 stop15h 50m
Multiple Airlines
Tue 9/2211:00 am
BSL
-
SEA
2 stops16h 36m
Multiple Airlines
Deal found 1/20$536
This FlightHub deal was found by Cheapflights users on 1/20. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/156:50 pm
SEA
-
BSL
1 stop15h 50m
Lufthansa
Tue 9/228:15 am
BSL
-
SEA
1 stop12h 40m
Lufthansa
Deal found 1/20$541

Find 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 January 21, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$479
(Mytrip)

One-way from

$288
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$622
Provider with most accurate pricing for Seattle/Tacoma Intl-Basel (EAP) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Basel (EAP) flights.
Search Deals
From Seattle/Tacoma Intl to Basel (EAP)
Search Deals
One-way flight from Seattle/Tacoma Intl to Basel (EAP)
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($96 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($22 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

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 January 21, 2026.
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

Thu 2/19

1:40 pm-1:50 pm

1 stop15h 10m

Basel EuroAirport Swiss

Wed 3/4

6:05 am-11:35 am

1 stop14h 30m

$482

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sat 3/7

6:50 pm-10:10 am

1 stop30h 20m

Basel EuroAirport Swiss

Sat 3/14

7:10 am-12:30 pm

1 stop13h 20m

$485

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Thu 3/5

6:50 pm-10:50 pm

1 stop19h 00m

Basel EuroAirport Swiss

Thu 3/12

3:40 pm-12:30 pm

1 stop28h 50m

$485

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Thu 2/26

7:15 am-7:05 pm

2 stops26h 50m

Basel EuroAirport Swiss

Sun 3/1

6:50 pm-11:04 pm

2 stops37h 14m

$486

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Thu 2/26

3:05 pm-10:40 am

1 stop34h 35m

Basel EuroAirport Swiss

Sun 3/1

5:55 pm-11:35 am

1 stop26h 40m

$488

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Thu 2/19

8:05 am-10:40 am

2 stops17h 35m

Basel EuroAirport Swiss

Wed 3/4

6:05 am-2:44 pm

2 stops17h 39m

$497

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sat 3/7

3:05 pm-5:25 pm

1 stop17h 20m

Basel EuroAirport Swiss

Sat 3/14

6:05 am-5:09 pm

2 stops19h 04m

$498

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Thu 3/5

8:00 am-7:40 pm

2 stops26h 40m

Basel EuroAirport Swiss

Thu 3/12

9:50 am-12:59 am

2 stops23h 09m

$499

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sat 3/7

5:20 pm-7:40 pm

2 stops17h 20m

Basel EuroAirport Swiss

Sat 3/14

9:50 am-8:58 pm

2 stops19h 08m

$499

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Thu 3/19

8:10 am-9:55 am

2 stops17h 45m

Basel EuroAirport Swiss

Mon 3/30

2:30 pm-12:20 pm

1 stop30h 50m

$499

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/21

Showing 1-10 of 21 results
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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 January.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*1 star
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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Basel flight deals on Cheapflights vs. FlightHub >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 AranGrant the most. AranGrant 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 $1,983). 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.

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 January 21, 2026.
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
7,736 reviews

Overall

6.8

Comfort

6.8

Crew

7.6

Entertainment

6.4

Food

6.3

Boarding

7.0

Reviews

1 / 20
6.0
Good

Anonymous,Dec 2025

SFO - MUC

The coordination between United and Lufthansa teams is poor and confusing.
Lufthansa
6.8
Okay
7,736 reviews
Lufthansa
6.8
Okay
7,736 reviews

Overall

6.8

Comfort

6.8

Crew

7.6

Entertainment

6.4

Food

6.3

Boarding

7.0

Reviews

1 / 20
6.0
Good

Anonymous,Dec 2025

SFO - MUC

The coordination between United and Lufthansa teams is poor and confusing.
British Airways
6.7
Okay
7,690 reviews
Lufthansa
6.8
Okay
7,736 reviews

Overall

6.8

Comfort

6.8

Crew

7.6

Entertainment

6.4

Food

6.3

Boarding

7.0

Reviews

1 / 20
6.0
Good

Anonymous,Dec 2025

SFO - MUC

The coordination between United and Lufthansa teams is poor and confusing.

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 15h 10m. 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 $467 on this airline. An additional option worth looking into is Lufthansa, starting at $483. British Airways is 27% 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 $1,983). 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 January 21, 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$467Average$729FlexibilityNo cancel feeOn-time70%
LufthansaCheapest$483Average$723FlexibilityNo cancel feeOn-time76%

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