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$342+ 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 7/21. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — EAP
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
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 July 3, 2025.

Round-trip from

$484
(British Airways)

One-way from

$342
(United Airlines)

Popular in

June

Cheapest in

January

Average price

$694
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. 9% potential increase in price ($68 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($18 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 3, 2025.

This Delta deal was found by Cheapflights users on 7/3. 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 11/41:40 pmSEA - BSL
1 stop15h 25mDelta
Tue 11/1111:15 amBSL - SEA
1 stop33h 35mDelta
Deal found 7/3$469
This British Airways deal was found by Cheapflights users on 7/1. 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 9/71:30 pmSEA - BSL
1 stop24h 20mBritish Airways
Wed 9/246:40 amBSL - SEA
1 stop13h 55mBritish Airways
Deal found 7/1$484
This United Airlines deal was found by Cheapflights users on 7/3. 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.
Sun 11/99:25 amSEA - BSL
2 stops25h 15mUnited Airlines
Fri 11/216:40 amBSL - SEA
1 stop14h 30mUnited Airlines
Deal found 7/3$509
This KLM deal was found by Cheapflights users on 7/3. 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.
Tue 9/91:55 pmSEA - BSL
1 stop22h 45mKLM
Wed 9/2410:10 amBSL - SEA
1 stop16h 30mKLM
Deal found 7/3$511
This Air Canada deal was found by Cheapflights users on 7/3. 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.
Sun 11/28:00 pmSEA - BSL
2 stops32h 10mAir Canada
Tue 11/1110:40 amBSL - SEA
2 stops20h 16mAir Canada
Deal found 7/3$515
This Lufthansa deal was found by Cheapflights users on 7/3. 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.
Fri 10/313:00 pmSEA - BSL
1 stop14h 35mLufthansa
Tue 11/116:50 amBSL - SEA
1 stop14h 20mLufthansa
Deal found 7/3$534
This Austrian Airlines deal was found by Cheapflights users on 7/3. 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 11/107:00 amSEA - BSL
2 stops27h 45mAustrian Airlines
Mon 11/1710:10 amBSL - SEA
2 stops43h 44mAustrian Airlines
Deal found 7/3$535

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 July 3, 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 11/4

1:40 pm-2:05 pm

1 stop15h 25m

Basel EuroAirport Swiss

Tue 11/11

11:15 am-11:50 am

1 stop33h 35m

$469

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sun 9/7

1:30 pm-10:50 pm

1 stop24h 20m

Basel EuroAirport Swiss

Wed 9/24

6:40 am-11:35 am

1 stop13h 55m

$484

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sun 11/9

9:25 am-7:40 pm

2 stops25h 15m

Basel EuroAirport Swiss

Fri 11/21

6:40 am-12:10 pm

1 stop14h 30m

$509

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 9/9

1:55 pm-9:40 pm

1 stop22h 45m

Basel EuroAirport Swiss

Wed 9/24

10:10 am-5:40 pm

1 stop16h 30m

$511

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sun 11/2

8:00 pm-1:10 pm

2 stops32h 10m

Basel EuroAirport Swiss

Tue 11/11

10:40 am-9:56 pm

2 stops20h 16m

$515

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Fri 10/31

3:00 pm-1:35 pm

1 stop14h 35m

Basel EuroAirport Swiss

Fri 11/14

6:40 am-12:10 pm

1 stop14h 30m

$534

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 11/10

7:00 am-7:45 pm

2 stops27h 45m

Basel EuroAirport Swiss

Mon 11/17

10:10 am-8:54 pm

2 stops43h 44m

$535

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 7/21

12:20 am-12:25 pm

2 stops27h 05m

$342

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 7/29

1:30 pm-10:55 am

1 stop12h 25m

$463

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Fri 7/11

5:05 pm-10:55 pm

1 stop20h 50m

$896

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/3

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 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 July 3, 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.

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 July 3, 2025.
Read through reviews of airlines operating flights from Seattle to Basel, such as Delta, KLM, and Air France. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,982 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,982 reviews
Delta
8.0
Very good
7,982 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,367 reviews
Delta
8.0
Very good
7,982 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Air France
7.5
Good
1,465 reviews
Delta
8.0
Very good
7,982 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
SWISS
7.5
Good
1,654 reviews
Delta
8.0
Very good
7,982 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,861 reviews
Delta
8.0
Very good
7,982 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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 $484 on this airline. Additional options worth looking into are KLM and Delta, starting at $511 and $515 round-trip. 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, 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 airline flying from Seattle to Basel

Discover the top airline 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 July 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$443Average$694FlexibilityNo cancel feeOn-time70%

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