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$462+ Cheap flights from Seattle (SEA) to Basel (EAP)

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 1/22. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — EAP
Jan 7 — Jan 141
Wed 1/7
Wed 1/14
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 December 8, 2025.

This Ovago deal was found by Cheapflights users on 12/7. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/267:00 amSEA - BSL
2 stops18h 05mLufthansa
Mon 1/57:05 pmBSL - SEA
2 stops34h 52mLufthansa
Deal found 12/7$1,220
This Air France deal was found by Cheapflights users on 12/7. 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.
Fri 12/263:05 pmSEA - BSL
1 stop22h 00mAir France
Mon 1/511:15 amBSL - SEA
1 stop33h 35mAir France
Deal found 12/7$1,313
This KLM deal was found by Cheapflights users on 12/8. 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 12/82:05 pmSEA - BSL
1 stop14h 45mKLM
Fri 12/266:05 amBSL - SEA
1 stop14h 45mKLM
Deal found 12/8$1,344
This oojo deal was found by Cheapflights users on 12/8. 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.
Mon 12/811:22 amSEA - BSL
2 stops25h 13mBritish Airways
Fri 12/267:00 amBSL - SEA
1 stop13h 30mBritish Airways
Deal found 12/8$1,345
This Delta deal was found by Cheapflights users on 12/8. 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.
Mon 12/89:30 amSEA - BSL
2 stops19h 20mDelta
Fri 12/266:05 amBSL - SEA
2 stops19h 28mDelta
Deal found 12/8$1,358
This Ovago deal was found by Cheapflights users on 12/7. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/257:00 amSEA - BSL
2 stops17h 55mLufthansa
Thu 1/17:05 pmBSL - SEA
2 stops32h 41mLufthansa
Deal found 12/7$1,370
This Air France deal was found by Cheapflights users on 12/7. 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 12/253:05 pmSEA - BSL
1 stop34h 35mAir France
Thu 1/16:05 amBSL - SEA
1 stop14h 45mAir France
Deal found 12/7$1,371
This Ovago deal was found by Cheapflights users on 12/6. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/257:00 pmSEA - BSL
1 stop37h 10mTurkish Airlines
Thu 1/110:55 amBSL - SEA
1 stop39h 10mTurkish Airlines
Deal found 12/6$1,373
This Ovago deal was found by Cheapflights users on 12/6. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/256:50 pmSEA - BSL
1 stop15h 15mBritish Airways
Thu 1/16:05 amBSL - SEA
2 stops26h 08mBritish Airways
Deal found 12/6$1,502

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 December 8, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$462
(oojo)

Popular in

June

Cheapest in

February

Average price

$835
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
Highest demand for flights based on searches. 13% potential increase in price ($98 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($20 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 8, 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

Fri 1/30

7:00 am-6:20 pm

2 stops26h 20m

Basel EuroAirport Swiss

Sun 2/15

6:45 am-7:16 pm

2 stops21h 31m

$478

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Thu 1/22

8:04 am-10:50 pm

2 stops29h 46m

Basel EuroAirport Swiss

Thu 1/29

3:40 pm-11:30 am

1 stop28h 50m

$482

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 3/23

10:59 pm-9:50 am

2 stops26h 51m

Basel EuroAirport Swiss

Mon 3/30

2:20 pm-11:35 am

1 stop30h 15m

$485

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Wed 1/14

6:50 pm-10:05 pm

1 stop18h 15m

Basel EuroAirport Swiss

Sun 1/18

11:20 am-4:55 pm

1 stop14h 35m

$487

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sun 3/22

4:00 pm-10:40 am

1 stop34h 40m

Basel EuroAirport Swiss

Mon 3/30

2:20 pm-11:35 am

1 stop30h 15m

$487

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 3/24

4:00 pm-5:25 pm

1 stop17h 25m

Basel EuroAirport Swiss

Mon 3/30

2:20 pm-11:35 am

1 stop30h 15m

$487

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 1/5

2:10 pm-1:50 pm

1 stop14h 40m

Basel EuroAirport Swiss

Tue 1/20

5:55 pm-11:50 am

1 stop26h 55m

$489

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-10:16 pm

2 stops21h 26m

$491

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 12/22

2:50 pm-6:15 pm

2 stops18h 25m

$3,557

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/8

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 December.
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 December 8, 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 December 8, 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
7,616 reviews

Boarding

7.0

Comfort

6.8

Food

6.3

Crew

7.6

Overall

6.8

Entertainment

6.4

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
7,616 reviews
Lufthansa
6.8
Okay
7,616 reviews

Boarding

7.0

Comfort

6.8

Food

6.3

Crew

7.6

Overall

6.8

Entertainment

6.4

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
7,564 reviews
Lufthansa
6.8
Okay
7,616 reviews

Boarding

7.0

Comfort

6.8

Food

6.3

Crew

7.6

Overall

6.8

Entertainment

6.4

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 26h 20m. 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 $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 December 8, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$467Average$694FlexibilityNo cancel feeOn-time70%
LufthansaCheapest$483Average$659FlexibilityNo cancel feeOn-time76%

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