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$282+ 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 6/13. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — EAP
May 4 — May 111
Sun 5/4
Sun 5/11
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 April 29, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$589
(American Airlines)

One-way from

$282
(Vakatrip)

Popular in

June

Cheapest in

January

Average price

$689
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. 22% potential increase in price ($205 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($35 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 29, 2025.

This American Airlines deal was found by Cheapflights users on 4/29. 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.
Mon 9/18:20 pmSEA - BSL
1 stop13h 00mMultiple Airlines
Mon 9/157:20 pmBSL - SEA
1 stop24h 50mMultiple Airlines
Deal found 4/29$589
This British Airways deal was found by Cheapflights users on 4/29. 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.
Mon 12/86:50 pmSEA - BSL
1 stop17h 45mBritish Airways
Fri 12/266:40 amBSL - SEA
1 stop13h 40mBritish Airways
Deal found 4/29$590
This American Airlines deal was found by Cheapflights users on 4/28. 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.
Mon 12/81:56 pmSEA - BSL
2 stops19h 14mAmerican Airlines
Fri 12/2611:15 amBSL - SEA
2 stops20h 51mAmerican Airlines
Deal found 4/28$604
This Vakatrip deal was found by Cheapflights users on 4/28. 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 Vakatrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/127:10 pmSEA - BSL
1 stop29h 30mTurkish Airlines
Thu 6/196:55 pmBSL - SEA
1 stop31h 20mTurkish Airlines
Deal found 4/28$637
This FlightHub deal was found by Cheapflights users on 4/28. 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.
Fri 8/82:20 pmSEA - BSL
1 stop18h 30mLufthansa
Fri 8/156:05 amBSL - SEA
1 stop14h 50mLufthansa
Deal found 4/28$656
This Delta deal was found by Cheapflights users on 4/28. 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.
Fri 8/87:10 amSEA - BSL
2 stops17h 25mDelta
Fri 8/156:15 amBSL - SEA
2 stops22h 14mDelta
Deal found 4/28$669
This United Airlines deal was found by Cheapflights users on 4/28. 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.
Fri 5/167:33 pmSEA - BSL
2 stops39h 02mUnited Airlines
Sat 5/2411:30 amBSL - SEA
2 stops32h 15mUnited Airlines
Deal found 4/28$881
This Austrian Airlines deal was found by Cheapflights users on 4/29. 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 Austrian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/98:00 amSEA - BSL
2 stops40h 40mAustrian Airlines
Mon 6/1610:20 amBSL - SEA
2 stops43h 21mAustrian Airlines
Deal found 4/29$1,054
This SWISS deal was found by Cheapflights users on 4/28. 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.
Thu 6/121:45 pmSEA - BSL
2 stops33h 05mSWISS
Thu 6/198:25 amBSL - SEA
2 stops19h 11mSWISS
Deal found 4/28$6,032

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 29, 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

Mon 9/1

8:20 pm-6:20 pm

1 stop13h 00m

Basel EuroAirport Swiss

Mon 9/15

7:20 pm-11:10 am

1 stop24h 50m

$589

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 9/1

3:10 pm-6:20 pm

2 stops18h 10m

Basel EuroAirport Swiss

Mon 9/15

7:20 pm-11:10 am

1 stop24h 50m

$594

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Thu 6/12

7:10 pm-9:40 am

1 stop29h 30m

Basel EuroAirport Swiss

Thu 6/19

6:55 pm-5:15 pm

1 stop31h 20m

$637

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Fri 8/8

2:20 pm-5:50 pm

1 stop18h 30m

Basel EuroAirport Swiss

Fri 8/15

6:05 am-11:55 am

1 stop14h 50m

$656

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Fri 8/8

7:10 am-9:35 am

2 stops17h 25m

Basel EuroAirport Swiss

Fri 8/15

6:15 am-7:29 pm

2 stops22h 14m

$669

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 5/27

8:20 pm-10:50 pm

1 stop17h 30m

Basel EuroAirport Swiss

Tue 6/3

6:45 am-11:10 am

1 stop13h 25m

$760

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Fri 5/16

7:33 pm-7:35 pm

2 stops39h 02m

Basel EuroAirport Swiss

Sat 5/24

11:30 am-10:45 am

2 stops32h 15m

$881

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 6/9

8:00 am-9:40 am

2 stops40h 40m

Basel EuroAirport Swiss

Mon 6/16

10:20 am-8:41 pm

2 stops43h 21m

$1,054

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Thu 6/12

1:45 pm-7:50 am

2 stops33h 05m

Basel EuroAirport Swiss

Thu 6/19

8:25 am-6:36 pm

2 stops19h 11m

$6,032

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Fri 6/13

2:15 pm-1:45 pm

1 stop14h 30m

$282

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

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*
FlightHubPrice Accuracy3 starsTrust Score*2 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 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 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 29, 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 29, 2025.
Read reviews from past customers who have flown Delta, KLM and Austrian Airlines from Seattle to Basel. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,936 reviews

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

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
7,936 reviews
Delta
8.0
Very good
7,936 reviews

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

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.
KLM
7.8
Good
1,333 reviews
Delta
8.0
Very good
7,936 reviews

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

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
780 reviews
Delta
8.0
Very good
7,936 reviews

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

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
1,588 reviews
Delta
8.0
Very good
7,936 reviews

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

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
7.4
Good
1,446 reviews
Delta
8.0
Very good
7,936 reviews

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

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 British Airways. Our recent data shows that you can find tickets from as low as $594 on this airline. Additional options worth looking into are Turkish Airlines and Lufthansa, starting at $637 and $656 round-trip. British Airways is 16% cheaper than the average price of flights available within the next 90 days to this destination.

  • 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 $282 on Lufthansa. Other airlines that offer cheap prices include Air France from $422 and Delta from $426 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

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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 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$443Average$694FlexibilityNo cancel feeOn-time70%
Air FranceCheapest$502Average$769FlexibilityNo cancel feeOn-time77%
DeltaCheapest$513Average$741FlexibilityNo cancel feeOn-timeN/A

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