HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Basel

$379+ 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 1/21. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — EAP
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
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 September 15, 2025.

Round-trip from

$452
(British Airways)

One-way from

$379
(British Airways)

Popular in

December

Cheapest in

February

Average price

$588
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. 9% potential increase in price ($68 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($25 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 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 September 15, 2025.

This British Airways deal was found by Cheapflights users on 9/14. 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.
Sun 12/76:50 pmSEA - BSL
1 stop30h 25mBritish Airways
Thu 12/183:40 pmBSL - SEA
1 stop28h 50mBritish Airways
Deal found 9/14$452
This British Airways deal was found by Cheapflights users on 9/14. 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.
Tue 12/99:00 amSEA - BSL
2 stops21h 05mBritish Airways
Tue 12/1611:00 amBSL - SEA
2 stops21h 38mBritish Airways
Deal found 9/14$467
This Air France deal was found by Cheapflights users on 9/14. 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.
Wed 10/293:10 pmSEA - BSL
1 stop14h 40mAir France
Wed 11/511:15 amBSL - SEA
1 stop33h 30mAir France
Deal found 9/14$468
This Delta deal was found by Cheapflights users on 9/14. 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.
Sun 12/72:05 pmSEA - BSL
1 stop34h 45mDelta
Tue 12/166:05 amBSL - SEA
1 stop14h 45mDelta
Deal found 9/14$470
This Delta deal was found by Cheapflights users on 9/14. 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.
Sat 12/611:00 pmSEA - BSL
2 stops25h 50mDelta
Tue 12/166:05 amBSL - SEA
1 stop14h 45mDelta
Deal found 9/14$473
This Air France deal was found by Cheapflights users on 9/14. 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.
Wed 10/293:10 pmSEA - BSL
1 stop14h 40mMultiple Airlines
Wed 11/56:05 amBSL - SEA
2 stops17h 40mMultiple Airlines
Deal found 9/14$478
This Delta deal was found by Cheapflights users on 9/14. 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.
Sun 12/72:05 pmSEA - BSL
1 stop34h 45mDelta
Mon 12/152:30 pmBSL - SEA
1 stop29h 55mDelta
Deal found 9/14$482
This Delta deal was found by Cheapflights users on 9/14. 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.
Sat 12/611:00 pmSEA - BSL
2 stops25h 50mDelta
Mon 12/152:30 pmBSL - SEA
1 stop29h 55mDelta
Deal found 9/14$485
This Delta deal was found by Cheapflights users on 9/14. 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 12/93:05 pmSEA - BSL
1 stop17h 20mDelta
Mon 12/152:30 pmBSL - SEA
1 stop29h 55mDelta
Deal found 9/14$493
This Delta deal was found by Cheapflights users on 9/14. 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.
Wed 10/291:40 pmSEA - BSL
2 stops19h 45mDelta
Wed 11/56:05 amBSL - SEA
2 stops21h 55mDelta
Deal found 9/14$496

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 September 15, 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

Sun 12/7

2:05 pm-9:50 am

1 stop34h 45m

Basel EuroAirport Swiss

Tue 12/16

6:05 am-11:50 am

1 stop14h 45m

$470

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sat 12/6

11:00 pm-9:50 am

2 stops25h 50m

Basel EuroAirport Swiss

Tue 12/16

6:05 am-11:50 am

1 stop14h 45m

$473

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 12/9

7:35 am-9:50 am

2 stops17h 15m

Basel EuroAirport Swiss

Mon 12/15

2:30 pm-11:25 am

1 stop29h 55m

$485

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 12/8

9:59 pm-10:40 am

2 stops27h 41m

Basel EuroAirport Swiss

Tue 12/16

6:05 am-11:50 am

1 stop14h 45m

$486

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Thu 11/6

2:00 pm-1:45 pm

1 stop14h 45m

Basel EuroAirport Swiss

Wed 11/12

8:25 pm-8:54 pm

2 stops33h 29m

$515

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Fri 1/30

7:46 am-2:10 pm

2 stops21h 24m

Basel EuroAirport Swiss

Tue 2/3

7:00 am-7:25 pm

2 stops21h 25m

$516

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Thu 11/6

10:35 am-3:05 pm

2 stops19h 30m

Basel EuroAirport Swiss

Wed 11/12

6:20 am-6:50 pm

2 stops21h 30m

$517

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Wed 12/10

9:25 am-7:40 pm

2 stops25h 15m

Basel EuroAirport Swiss

Wed 12/17

9:50 am-1:20 pm

1 stop12h 30m

$518

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 12/9

3:40 pm-7:40 pm

2 stops19h 00m

Basel EuroAirport Swiss

Wed 12/17

9:50 am-1:20 pm

1 stop12h 30m

$518

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sun 12/7

7:10 am-7:40 pm

2 stops27h 30m

Basel EuroAirport Swiss

Wed 12/17

9:50 am-1:20 pm

1 stop12h 30m

$518

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 21 results
1
2
3

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 September 15, 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 September 15, 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
7,407 reviews

Comfort

6.8

Entertainment

6.4

Food

6.3

Overall

6.8

Crew

7.6

Boarding

7.0

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
7,407 reviews
Lufthansa
6.8
Okay
7,407 reviews

Comfort

6.8

Entertainment

6.4

Food

6.3

Overall

6.8

Crew

7.6

Boarding

7.0

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
7,361 reviews
Lufthansa
6.8
Okay
7,407 reviews

Comfort

6.8

Entertainment

6.4

Food

6.3

Overall

6.8

Crew

7.6

Boarding

7.0

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 34h 45m. There are 5207 mi between Seattle and Basel.

  • 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.

  • 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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$443Average$694FlexibilityNo cancel feeOn-time70%
DeltaCheapest$513Average$741FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$571Average$725FlexibilityNo cancel feeOn-time76%

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.