HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Basel

$420+ 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 5/11. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — EAP
Apr 22 — Apr 291
Tue 4/22
Tue 4/29
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Seattle to Basel with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 April 17, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$755
(Delta)

One-way from

$420
(Air France)

Popular in

June

Cheapest in

January

Average price

$689
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. 28% potential increase in price ($290 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 9% potential price decrease ($63 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2025
Search Deals

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 April 17, 2025.

This Delta deal was found by Cheapflights users on 4/17. 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 8/1210:55 pmSEA - BSL
2 stops25h 40mDelta
Tue 8/266:15 amBSL - SEA
1 stop14h 20mDelta
Deal found 4/17$561
This United Airlines deal was found by Cheapflights users on 4/17. 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.
Wed 8/1311:11 amSEA - BSL
2 stops16h 14mUnited Airlines
Tue 8/269:45 amBSL - SEA
2 stops19h 57mUnited Airlines
Deal found 4/17$568
This Lufthansa deal was found by Cheapflights users on 4/17. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/121:55 pmSEA - BSL
2 stops20h 40mLufthansa
Mon 8/252:15 pmBSL - SEA
2 stops39h 27mLufthansa
Deal found 4/17$589
This British Airways deal was found by Cheapflights users on 4/17. 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.
Wed 8/131:30 pmSEA - BSL
1 stop20h 30mBritish Airways
Tue 8/266:45 amBSL - SEA
1 stop13h 25mBritish Airways
Deal found 4/17$621
This American Airlines deal was found by Cheapflights users on 4/17. 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.
Sun 5/181:30 pmSEA - BSL
1 stop24h 20mAmerican Airlines
Tue 6/36:45 amBSL - SEA
1 stop13h 25mAmerican Airlines
Deal found 4/17$636
This Expedia deal was found by Cheapflights users on 4/17. 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.
Sun 5/181:30 pmSEA - BSL
1 stop20h 30mMultiple Airlines
Tue 6/36:45 amBSL - SEA
1 stop13h 25mMultiple Airlines
Deal found 4/17$638
This Air Canada deal was found by Cheapflights users on 4/17. 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.
Wed 8/137:20 amSEA - BSL
2 stops18h 35mAir Canada
Mon 8/2511:30 amBSL - SEA
2 stops42h 11mAir Canada
Deal found 4/17$664
This FlightHub deal was found by Cheapflights users on 4/16. 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.
Sat 4/267:10 pmSEA - BSL
1 stop29h 30mTurkish Airlines
Wed 4/306:55 pmBSL - SEA
1 stop31h 20mTurkish Airlines
Deal found 4/16$912
This SWISS deal was found by Cheapflights users on 4/17. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/11:45 pmSEA - BSL
2 stops33h 10mSWISS
Sun 6/88:30 amBSL - SEA
2 stops19h 03mSWISS
Deal found 4/17$1,035
This Air France deal was found by Cheapflights users on 4/17. 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 7/121:30 pmSEA - BSL
2 stops15h 20mAir France
Mon 8/410:15 amBSL - SEA
1 stop14h 40mAir France
Deal found 4/17$1,569

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 April 17, 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

Tue 8/12

10:55 pm-9:35 am

2 stops25h 40m

Basel EuroAirport Swiss

Tue 8/26

6:15 am-11:35 am

1 stop14h 20m

$561

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Wed 8/13

11:11 am-12:25 pm

2 stops16h 14m

Basel EuroAirport Swiss

Tue 8/26

9:45 am-8:42 pm

2 stops19h 57m

$568

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 8/12

1:55 pm-7:35 pm

2 stops20h 40m

Basel EuroAirport Swiss

Mon 8/25

2:15 pm-8:42 pm

2 stops39h 27m

$589

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Wed 8/13

1:30 pm-7:00 pm

1 stop20h 30m

Basel EuroAirport Swiss

Tue 8/26

6:45 am-11:10 am

1 stop13h 25m

$621

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sun 5/18

1:30 pm-10:50 pm

1 stop24h 20m

Basel EuroAirport Swiss

Tue 6/3

6:45 am-11:10 am

1 stop13h 25m

$636

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sun 5/18

1:30 pm-7:00 pm

1 stop20h 30m

Basel EuroAirport Swiss

Tue 6/3

6:45 am-11:10 am

1 stop13h 25m

$638

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Wed 8/13

7:20 am-10:55 am

2 stops18h 35m

Basel EuroAirport Swiss

Mon 8/25

11:30 am-8:41 pm

2 stops42h 11m

$664

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sun 4/27

7:10 pm-6:00 pm

1 stop37h 50m

Basel EuroAirport Swiss

Tue 5/6

6:55 pm-5:15 pm

1 stop31h 20m

$925

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sun 6/1

1:45 pm-7:55 am

2 stops33h 10m

Basel EuroAirport Swiss

Sun 6/8

8:30 am-6:33 pm

2 stops19h 03m

$1,035

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sat 7/12

1:30 pm-1:50 pm

2 stops15h 20m

Basel EuroAirport Swiss

Mon 8/4

10:15 am-3:55 pm

1 stop14h 40m

$1,569

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/17

Showing 1-10 of 16 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 April.
ProviderPrice AccuracyTrust Score*
AranGrantPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 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 AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on Seattle-Basel flight deals on Cheapflights vs. AranGrant >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, January is the cheapest month in which you can book a flight from Seattle to Basel (average of $545). Flying from Seattle to Basel in June is currently the most expensive (average of $1,132). 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 April 17, 2025.

Unlike in the evening, when flights are generally more expensive, you can save up to 5% on flights from Seattle to Basel by exploring options for tickets in the morning.

Rainfall in Basel by month

Plan your trip to Basel by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Basel ranges from 1.9 - 3.4 inches per month. June is typically the wettest month, when rainfall can reach 3.4 in. February is typically the driest time to visit Basel when rainfall is around 1.9 in.

Temperature in Basel by month

Plan your trip to Basel by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Basel, 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 January, when temperatures are typically at their lowest (around 33.8 F).

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 April 17, 2025.
Delta
8.0
Very good
7,917 reviews

Boarding

8.2

Overall

8.0

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,917 reviews
Delta
8.0
Very good
7,917 reviews

Boarding

8.2

Overall

8.0

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Austrian Airlines
7.6
Good
775 reviews
Delta
8.0
Very good
7,917 reviews

Boarding

8.2

Overall

8.0

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Air France
7.5
Good
1,435 reviews
Delta
8.0
Very good
7,917 reviews

Boarding

8.2

Overall

8.0

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
SWISS
7.5
Good
1,580 reviews
Delta
8.0
Very good
7,917 reviews

Boarding

8.2

Overall

8.0

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
8,667 reviews
Delta
8.0
Very good
7,917 reviews

Boarding

8.2

Overall

8.0

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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.

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

    Our cheapest airline available from Seattle to Basel is Delta. Our recent data shows that you can find tickets from as low as $755 on this airline. Additional options worth looking into are United Airlines and Lufthansa, starting at $775 and $777 round-trip.

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

    One-way options have recently been found by users for as low as $420 on Air France. Other airlines that offer cheap prices include Lufthansa from $428 and United Airlines from $453 one-way.

  • 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, January is the cheapest month in which you can book a flight from Seattle to Basel (average of $545). Flying from Seattle to Basel in June is currently the most expensive (average of $1,132). 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 3 airlines flying from Seattle to Basel

Discover the top 3 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 April 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$443Average$690FlexibilityNo cancel feeOn-time70%
Air FranceCheapest$502Average$769FlexibilityNo cancel feeOn-time77%
DeltaCheapest$513Average$741FlexibilityNo cancel feeOn-timeN/A

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.