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$357+ Cheap flights from Washington to Basel EuroAirport Swiss (BSL)

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 2/16. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BSL
Mar 7 — Mar 141
Sat 3/7
Sat 3/14
1 adult, Economy
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Cheap flight deals from Washington to Basel

Cheapest flights from Washington to Basel
Explore the most affordable flight options available from Washington to Basel. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 5, 2026.

This KLM deal was found by Cheapflights users on 2/2. 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.
Mon 3/22:10 pm
SEA
-
BSL
1 stop14h 40m
Multiple Airlines
Mon 3/95:55 pm
BSL
-
SEA
1 stop26h 40m
Multiple Airlines
Deal found 2/2$480
This Delta deal was found by Cheapflights users on 2/2. 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.
Mon 3/93:10 pm
SEA
-
BSL
1 stop14h 40m
Delta
Wed 3/1811:15 am
BSL
-
SEA
1 stop33h 20m
Delta
Deal found 2/2$484
This oojo deal was found by Cheapflights users on 2/3. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/31:37 pm
SEA
-
BSL
2 stops23h 43m
British Airways
Tue 3/107:05 pm
BSL
-
SEA
1 stop30h 50m
British Airways
Deal found 2/3$485
This Delta deal was found by Cheapflights users on 2/2. 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 3/83:10 pm
SEA
-
BSL
1 stop34h 40m
Delta
Tue 3/176:05 am
BSL
-
SEA
1 stop14h 30m
Delta
Deal found 2/2$486
This oojo deal was found by Cheapflights users on 2/2. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/61:35 pm
SEA
-
BSL
1 stop15h 35m
British Airways
Wed 3/116:20 am
BSL
-
SEA
1 stop19h 35m
British Airways
Deal found 2/2$488
This Delta deal was found by Cheapflights users on 2/2. 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 3/37:10 am
SEA
-
BSL
2 stops17h 40m
Delta
Thu 3/126:05 am
BSL
-
SEA
1 stop14h 30m
Delta
Deal found 2/2$489
This Air France deal was found by Cheapflights users on 2/3. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/184:05 pm
SEA
-
BSL
1 stop22h 00m
Air France
Wed 3/256:05 am
BSL
-
SEA
1 stop14h 30m
Air France
Deal found 2/3$490
This British Airways deal was found by Cheapflights users on 2/2. 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 3/31:25 pm
SEA
-
BSL
1 stop16h 40m
British Airways
Mon 3/164:00 pm
BSL
-
SEA
1 stop33h 55m
British Airways
Deal found 2/2$491
This Air France deal was found by Cheapflights users on 2/2. 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 3/28:05 am
SEA
-
BSL
2 stops17h 35m
Air France
Mon 3/96:05 am
BSL
-
SEA
2 stops18h 36m
Air France
Deal found 2/2$492
This Delta deal was found by Cheapflights users on 2/2. 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.
Mon 3/93:10 pm
SEA
-
BSL
1 stop14h 40m
Delta
Tue 3/246:05 am
BSL
-
SEA
2 stops36h 40m
Delta
Deal found 2/2$494
This oojo deal was found by Cheapflights users on 2/4. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2812:04 pm
PDX
-
BSL
2 stops26h 01m
British Airways
Sat 10/316:00 pm
BSL
-
PDX
1 stop30h 55m
British Airways
Deal found 2/4$620
This British Airways deal was found by Cheapflights users on 2/4. 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 3/45:45 pm
PDX
-
BSL
1 stop19h 20m
British Airways
Sun 3/811:20 am
BSL
-
PDX
1 stop13h 35m
British Airways
Deal found 2/4$643

Find flight deals from Washington to Basel

Keep the following information in mind while searching for Washington to Basel flight deals. Data was last updated February 5, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$480
(KLM)

One-way from

$357
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$532
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 Washington to Basel EuroAirport Swiss
Search Deals
One-way flight from Washington to Basel EuroAirport Swiss
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($96 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($22 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington 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 February 5, 2026.
Use the filters below to find and compare flights from Washington to Basel EuroAirport Swiss that are best for you.

Fly from

Washington

Fly to

Basel

Route

Depart

Return

Price

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 3/9

3:10 pm-1:50 pm

1 stop14h 40m

Basel EuroAirport Swiss

Tue 3/17

11:15 am-12:35 pm

1 stop33h 20m

$484

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sun 3/8

3:10 pm-9:50 am

1 stop34h 40m

Basel EuroAirport Swiss

Thu 3/19

6:05 am-12:35 pm

1 stop14h 30m

$486

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 3/3

7:10 am-1:50 pm

2 stops21h 40m

Basel EuroAirport Swiss

Mon 3/16

11:15 am-12:35 pm

1 stop33h 20m

$489

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 3/3

7:10 am-9:50 am

2 stops17h 40m

Basel EuroAirport Swiss

Tue 3/17

6:05 am-12:35 pm

1 stop14h 30m

$489

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 3/3

7:10 am-1:50 pm

2 stops21h 40m

Basel EuroAirport Swiss

Thu 3/19

6:05 am-12:35 pm

1 stop14h 30m

$489

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 3/3

7:10 am-1:50 pm

2 stops21h 40m

Basel EuroAirport Swiss

Tue 3/10

6:05 am-12:35 pm

1 stop14h 30m

$489

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 3/3

7:10 am-9:50 am

2 stops17h 40m

Basel EuroAirport Swiss

Thu 3/12

6:05 am-12:35 pm

1 stop14h 30m

$489

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 3/9

10:58 pm-9:50 am

2 stops26h 52m

Basel EuroAirport Swiss

Mon 3/16

11:15 am-12:35 pm

1 stop33h 20m

$489

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Wed 3/18

4:05 pm-10:05 pm

1 stop22h 00m

Basel EuroAirport Swiss

Wed 3/25

6:05 am-12:35 pm

1 stop14h 30m

$490

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 3/3

6:50 pm-10:15 am

1 stop30h 25m

Basel EuroAirport Swiss

Wed 3/18

6:20 am-5:55 pm

1 stop19h 35m

$491

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/5

Showing 1-10 of 36 results
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Best time to book a flight from Washington to Basel

Have a flexible travel schedule? Discover the best time to fly to Basel from Washington 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 Washington to Basel EuroAirport Swiss

What is the cheapest month to book a flight from State of Washington to Basel EuroAirport Swiss?

Currently, August is the cheapest month in which you can book a flight from State of Washington to Basel EuroAirport Swiss (average of $385). Flying from State of Washington to Basel EuroAirport Swiss in May is currently the most expensive (average of $1,983). 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.

Related info for your journey

Find useful and relevant information for your journey from Washington to Basel. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Basel from Washington?

    Basel EuroAirport Swiss (BSL) is the airport you will fly into if you book a flight from Washington to Basel. It is only a 3.6 mi journey from EuroAirport Swiss (BSL) to Basel’s city center.

  • How long is the flight from State of Washington to Basel EuroAirport Swiss?

    Delta, British Airways, and Air France can get you from State of Washington to Basel EuroAirport Swiss in just under 14h 40m. Your travel time can differ by up to 16h 50m. The distance from State of Washington to Basel EuroAirport Swiss is about 5207 mi. This flight may include one or multiple stops.

  • What are the most popular routes from State of Washington to Basel EuroAirport Swiss?

    When deciding which route to take from State of Washington to Basel EuroAirport Swiss consider Seattle/Tacoma Intl - Basel EuroAirport Swiss, Portland - Basel EuroAirport Swiss or Pasco Tri Cities - Basel EuroAirport Swiss as they are the most popular.

  • Can I find deals for flights from Washington to Basel that include hotel bookings?

    Yes. In addition to deals on Washington to Basel flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Washington to Basel?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington to Basel.

  • Can I find deals for business class flights from Washington to Basel?

    Yes. Cheapflights offers flight deals from Washington 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 State of Washington to Basel EuroAirport Swiss?

    Currently, August is the cheapest month in which you can book a flight from State of Washington to Basel EuroAirport Swiss (average of $385). Flying from State of Washington to Basel EuroAirport Swiss in May is currently the most expensive (average of $1,983). 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 2 airlines flying from Washington to Basel

Discover the top 2 airlines that operate flights from Washington 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 February 5, 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$467Average$729FlexibilityNo cancel feeOn-time70%
LufthansaCheapest$483Average$723FlexibilityNo cancel feeOn-time76%

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