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$351+ 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 9/13. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — EAP
Sep 2 — Sep 91
Tue 9/2
Tue 9/9
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 August 28, 2025.

Round-trip from

$502
(Expedia)

One-way from

$351
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$582
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. 10% potential increase in price ($76 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($19 potential savings vs. average RT price).
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Average for round-trip flights in August 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 August 28, 2025.

This Expedia deal was found by Cheapflights users on 8/27. 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.
Tue 11/116:50 pmSEA - BSL
1 stop30h 25mBritish Airways
Wed 11/1911:10 amBSL - SEA
1 stop14h 45mBritish Airways
Deal found 8/27$502
This American Airlines deal was found by Cheapflights users on 8/27. 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.
Tue 11/1110:39 amSEA - BSL
2 stops19h 26mAmerican Airlines
Wed 11/196:20 amBSL - SEA
2 stops21h 30mAmerican Airlines
Deal found 8/27$514
This Booking.com deal was found by Cheapflights users on 8/27. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/115:50 amSEA - BSL
2 stops21h 40mMultiple Airlines
Wed 11/199:50 amBSL - SEA
1 stop12h 30mMultiple Airlines
Deal found 8/27$533
This Cheapflightsfares deal was found by Cheapflights users on 8/27. 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.
Thu 11/62:00 pmSEA - BSL
1 stop19h 20mLufthansa
Wed 11/126:45 amBSL - SEA
2 stops25h 00mLufthansa
Deal found 8/27$537
This United Airlines deal was found by Cheapflights users on 8/27. 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 11/116:20 amSEA - BSL
3 stops28h 20mUnited Airlines
Wed 11/199:50 amBSL - SEA
3 stops24h 09mUnited Airlines
Deal found 8/27$544
This Cheapflightsfares deal was found by Cheapflights users on 8/28. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/142:20 pmSEA - BSL
1 stop11h 30mLufthansa
Thu 10/238:25 amBSL - SEA
1 stop12h 30mLufthansa
Deal found 8/28$547
This Air France deal was found by Cheapflights users on 8/27. 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.
Mon 12/82:00 pmSEA - BSL
1 stop34h 50mAir France
Fri 12/266:05 amBSL - SEA
1 stop14h 45mAir France
Deal found 8/27$568
This KAYAK deal was found by Cheapflights users on 8/28. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/83:40 pmSEA - BSL
2 stops43h 00mMultiple Airlines
Fri 12/269:50 amBSL - SEA
1 stop12h 30mMultiple Airlines
Deal found 8/28$582

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 August 28, 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 11/11

6:50 pm-10:15 am

1 stop30h 25m

Basel EuroAirport Swiss

Wed 11/19

11:10 am-4:55 pm

1 stop14h 45m

$502

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 11/11

10:39 am-3:05 pm

2 stops19h 26m

Basel EuroAirport Swiss

Wed 11/19

6:20 am-6:50 pm

2 stops21h 30m

$514

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Wed 11/19

2:05 pm-1:50 pm

1 stop14h 45m

Basel EuroAirport Swiss

Sun 11/23

11:15 am-11:45 am

1 stop33h 30m

$518

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 11/11

5:50 am-12:30 pm

2 stops21h 40m

Basel EuroAirport Swiss

Wed 11/19

9:50 am-1:20 pm

1 stop12h 30m

$533

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Wed 12/3

3:10 pm-7:40 pm

1 stop19h 30m

Basel EuroAirport Swiss

Fri 12/12

6:45 am-12:10 pm

1 stop14h 25m

$537

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Thu 11/6

2:00 pm-6:20 pm

1 stop19h 20m

Basel EuroAirport Swiss

Wed 11/12

6:45 am-10:45 pm

2 stops25h 00m

$537

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 11/11

3:48 pm-7:40 pm

2 stops18h 52m

Basel EuroAirport Swiss

Wed 11/19

9:50 am-1:20 pm

1 stop12h 30m

$538

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sat 9/13

9:39 pm-7:10 am

3 stops48h 31m

$351

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Wed 9/3

7:15 am-10:55 am

2 stops18h 40m

$401

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Wed 9/3

2:10 pm-9:40 pm

1 stop22h 30m

$427

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/27

Showing 1-10 of 18 results
1
2

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 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 August 28, 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.

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 August 28, 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
7,368 reviews

Overall

6.8

Entertainment

6.4

Food

6.3

Comfort

6.8

Boarding

7.0

Crew

7.6

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
7,368 reviews
Lufthansa
6.8
Okay
7,368 reviews

Overall

6.8

Entertainment

6.4

Food

6.3

Comfort

6.8

Boarding

7.0

Crew

7.6

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
7,316 reviews
Lufthansa
6.8
Okay
7,368 reviews

Overall

6.8

Entertainment

6.4

Food

6.3

Comfort

6.8

Boarding

7.0

Crew

7.6

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 14h 45m. 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 $443 on this airline. Additional options worth looking into are Delta and Lufthansa, starting at $513 and $571 round-trip. British Airways is 33% 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 $401 on Air Canada. Other airlines that offer cheap prices include KLM from $427 and Lufthansa from $434 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 August 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$443Average$694FlexibilityNo cancel feeOn-time70%
DeltaCheapest$513Average$741FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$571Average$623FlexibilityNo cancel feeOn-time76%

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