What are the cheapest airlines flying from Washington, D.C. to Basel EuroAirport Swiss round-trip?

Flying on Turkish Airlines is currently your cheapest option to Basel EuroAirport Swiss, with prices starting at $566. Additional round-trip tickets that might be worth considering are offered by British Airways and American Airlines, with the lowest prices starting at $601 and $614, respectively.

What are the cheapest airlines to fly from Washington, D.C. to Basel EuroAirport Swiss one-way?

To fly one-way, consider booking your trip with British Airways, which is currently one of the cheapest options available, starting at $507. Delta flights start at $538 while deals on United Airlines start at $540 one-way.

What is the cheapest month to book a flight from Washington, D.C. to Basel EuroAirport Swiss?

Currently, January is the cheapest month in which you can book a flight from Washington, D.C. to Basel EuroAirport Swiss (average of $545). Flying from Washington, D.C. to Basel EuroAirport Swiss 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 day to fly from Washington, D.C. to Basel EuroAirport Swiss?

Travelers seeking maximum savings on their Washington, D.C. to Basel EuroAirport Swiss flight should consider departing on Tuesday evenings when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

In terms of precipitation, rainfall in Basel EuroAirport Swiss 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 EuroAirport Swiss when rainfall is around 1.9 in.

If weather is an important factor for your trip to Basel EuroAirport Swiss, 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).

What are the most popular routes from Washington, D.C. to Basel EuroAirport Swiss?

While some choose either Baltimore/Washington - Basel EuroAirport Swiss or Washington, D.C. Reagan-National - Basel EuroAirport Swiss, Washington, D.C. Dulles Intl - Basel EuroAirport Swiss is the most popular route from Washington, D.C. to Basel EuroAirport Swiss.

What is the cheapest day to fly round-trip from Washington, D.C. to Basel EuroAirport Swiss?

Flights from Washington, D.C. to Basel EuroAirport Swiss are found to be more expensive on Thursday. This shouldn't discourage you from searching as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Basel EuroAirport Swiss.

What is the cheapest month to fly from Washington, D.C. to Basel EuroAirport Swiss?

Our data shows that September tends to be the cheapest month to fly to Basel EuroAirport Swiss from Washington, D.C.. Users have commonly found prices around $1,367 for the month, but tickets can be as low as $571. Due to multiple factors, prepare for potentially higher prices in January.

What is the cheapest time of day to fly from WAS to BSL?

A simple way to save on the total cost of your ticket is to fly from Washington, D.C. to Basel EuroAirport Swiss at noon. If you’re flexible enough to do this you can expect to save up to 31% on your trip compared to booking a flight in the morning.

What airport do you fly into for flights to Basel from Washington, D.C.?

For a flight from Washington, D.C. to Basel, you will be flying into EuroAirport Swiss. Basel EuroAirport Swiss (BSL) is just 3.6 mi from the center of the city. EuroAirport Swiss is the only Basel airport and it handles 0 inbound flights from Washington, D.C. per day. 1 airline has flights to Basel EuroAirport Swiss from Washington, D.C. on a regular basis.

Can I find deals for flights from Washington, D.C. to Basel that include hotel bookings?

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

How can I find direct flights from Washington, D.C. to Basel?

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

Can I find deals for business class flights from Washington, D.C. to Basel?

Yes. Cheapflights offers flight deals from Washington, D.C. 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.

$256+ Flights from Washington, D.C. to Basel EuroAirport Swiss

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Cheap flight deals from Washington, D.C. to Basel

Round-trip from	$534 (Connections by easyJet)
One-way from	$256 (Kiwi.com)
Popular in	January
Cheapest in	September
Average price	$955

From Washington, D.C. (WAS) to Basel EuroAirport Swiss

Search Deals

One-way flight from Washington, D.C. (WAS) to Basel EuroAirport Swiss

Search Deals

Highest demand for flights based on searches. 61% potential increase in price ($2,156 potential increase over avg. RT price).

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Cheapest flight prices on average. 45% potential price decrease ($426 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 Washington, D.C. to Basel

Cheapest flights from Washington, D.C. to Basel
Explore the most affordable flight options available from Washington, D.C. to Basel. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 31, 2025.

Mon 9/11:30 pmIAD - BSL

1 stop22h 30mTurkish Airlines

Thu 9/186:55 pmBSL - IAD

1 stop22h 50mTurkish Airlines

Deal found 7/29

$529

Mon 8/256:50 pmBWI - BSL

1 stop29h 10mMultiple Airlines

Tue 9/99:20 pmBSL - BWI

1 stop26h 20mMultiple Airlines

Deal found 7/31

$534

Tue 12/28:35 pmBWI - BSL

1 stop19h 45mBritish Airways

Tue 12/911:00 amBSL - BWI

1 stop13h 45mBritish Airways

Deal found 7/31

$601

Mon 8/256:00 amDCA - BSL

2 stops22h 50mAir Canada

Tue 9/911:25 amBSL - DCA

2 stops16h 26mAir Canada

Deal found 7/29

$604

Tue 12/26:00 pmIAD - BSL

1 stop9h 55mMultiple Airlines

Tue 12/910:35 amBSL - IAD

2 stops15h 54mMultiple Airlines

Deal found 7/31

$612

Mon 12/11:58 pmIAD - BSL

2 stops18h 37mAmerican Airlines

Wed 12/106:20 amBSL - IAD

2 stops19h 08mAmerican Airlines

Deal found 7/29

$614

Tue 12/25:30 pmDCA - BSL

2 stops15h 35mAmerican Airlines

Tue 12/97:00 amBSL - DCA

2 stops15h 27mAmerican Airlines

Deal found 7/31

$614

Tue 12/25:45 pmDCA - BSL

2 stops15h 20mBritish Airways

Tue 12/911:00 amBSL - DCA

2 stops14h 55mBritish Airways

Deal found 7/28

$617

Mon 12/111:10 pmIAD - BSL

1 stop10h 50mUnited Airlines

Wed 12/109:45 amBSL - IAD

2 stops17h 35mUnited Airlines

Deal found 7/31

$619

Fri 11/74:30 pmDCA - BSL

2 stops17h 30mUnited Airlines

Tue 11/119:45 amBSL - DCA

2 stops16h 55mUnited Airlines

Deal found 7/28

$675

Fri 9/1210:40 pmIAD - BSL

1 stop18h 10mBritish Airways

Fri 9/196:00 amBSL - IAD

2 stops18h 51mBritish Airways

Deal found 7/29

$692

Thu 9/259:35 amIAD - BSL

2 stops19h 20mAir Canada

Mon 9/298:25 amBSL - IAD

2 stops31h 13mAir Canada

Deal found 7/29

$794

Best flights from Washington, D.C. to Basel
Discover carefully curated flight deals from Washington, D.C. to Basel that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 31, 2025.

Mon 9/11:30 pmIAD - BSL

1 stop22h 30mTurkish Airlines

Thu 9/186:55 pmBSL - IAD

1 stop22h 50mTurkish Airlines

Deal found 7/29

$529

Mon 8/256:50 pmBWI - BSL

1 stop29h 10mMultiple Airlines

Tue 9/99:20 pmBSL - BWI

1 stop26h 20mMultiple Airlines

Deal found 7/31

$534

Tue 12/28:35 pmBWI - BSL

1 stop19h 45mBritish Airways

Tue 12/911:00 amBSL - BWI

1 stop13h 45mBritish Airways

Deal found 7/31

$601

Mon 8/256:00 amDCA - BSL

2 stops22h 50mAir Canada

Tue 9/911:25 amBSL - DCA

2 stops16h 26mAir Canada

Deal found 7/29

$604

Mon 9/110:25 pmIAD - BSL

2 stops15h 10mUnited Airlines

Thu 9/1811:30 amBSL - IAD

1 stop14h 30mUnited Airlines

Deal found 7/29

$637

Tue 8/195:25 pmIAD - BSL

1 stop34h 15mAustrian Airlines

Mon 9/18:25 pmBSL - IAD

1 stop24h 10mAustrian Airlines

Deal found 7/29

$650

Fri 9/197:21 pmIAD - BSL

2 stops21h 29mAmerican Airlines

Thu 9/256:10 amBSL - IAD

2 stops16h 28mAmerican Airlines

Deal found 7/30

$734

Sat 8/165:40 pmIAD - BSL

1 stop12h 45mLufthansa

Sat 8/236:05 amBSL - IAD

1 stop15h 10mLufthansa

Deal found 7/29

$899

Mon 8/253:25 pmIAD - BSL

1 stop10h 30mMultiple Airlines

Tue 9/911:25 amBSL - IAD

2 stops29h 48mMultiple Airlines

Deal found 7/31

$622

Fri 9/1210:40 pmIAD - BSL

1 stop18h 10mBritish Airways

Fri 9/196:00 amBSL - IAD

2 stops18h 51mBritish Airways

Deal found 7/29

$692

Wed 8/131:44 pmDCA - BSL

2 stops15h 36mAmerican Airlines

Sun 8/177:05 amBSL - DCA

2 stops18h 10mAmerican Airlines

Deal found 7/30

$792

Thu 9/259:35 amIAD - BSL

2 stops19h 20mAir Canada

Mon 9/298:25 amBSL - IAD

2 stops31h 13mAir Canada

Deal found 7/29

$794

Last-minute flights from Washington, D.C. to Basel
Discover last-minute flight deals from Washington, D.C. to Basel. Data last updated July 31, 2025 and is based on user searches.

Tue 8/56:50 pmBWI - BSL

2 stops15h 50mMultiple Airlines

Thu 8/146:10 amBSL - BWI

1 stop19h 35mMultiple Airlines

Deal found 7/31

$1,430

Tue 8/53:25 pmIAD - BSL

1 stop10h 25mLufthansa

Thu 8/148:25 amBSL - IAD

1 stop11h 05mLufthansa

Deal found 7/31

$1,518

Tue 8/511:46 amBWI - BSL

2 stops17h 09mAmerican Airlines

Thu 8/146:10 amBSL - BWI

2 stops16h 38mAmerican Airlines

Deal found 7/31

$1,556

Sat 8/910:18 pmIAD - BSL

2 stops32h 07mUnited Airlines

Sat 8/161:00 pmBSL - IAD

1 stop32h 20mUnited Airlines

Deal found 7/31

$1,441

Sun 8/107:25 pmIAD - BSL

1 stop16h 55mBritish Airways

Thu 8/146:10 amBSL - IAD

1 stop20h 00mBritish Airways

Deal found 7/30

$1,766

Sun 8/109:35 pmBWI - BSL

1 stop19h 15mBritish Airways

Thu 8/146:10 amBSL - BWI

1 stop19h 35mBritish Airways

Deal found 7/30

$1,766

Sun 8/1012:40 pmIAD - BSL

2 stops16h 15mAir Canada

Thu 8/148:25 amBSL - IAD

2 stops32h 49mAir Canada

Deal found 7/30

$1,777

Sun 8/106:05 pmIAD - BSL

2 stops19h 40mAustrian Airlines

Thu 8/148:25 pmBSL - IAD

1 stop24h 10mAustrian Airlines

Deal found 7/30

$2,002

Sun 8/104:51 pmDCA - BSL

2 stops14h 19mDelta

Thu 8/1410:15 amBSL - DCA

2 stops14h 44mDelta

Deal found 7/30

$2,510

Sun 8/1012:27 pmBWI - BSL

2 stops15h 08mDelta

Thu 8/146:15 amBSL - BWI

2 stops15h 36mDelta

Deal found 7/30

$2,536

Wed 8/131:44 pmDCA - BSL

2 stops15h 36mAmerican Airlines

Sun 8/177:05 amBSL - DCA

2 stops18h 10mAmerican Airlines

Deal found 7/30

$792

Sat 8/167:45 pmBWI - BSL

2 stops21h 05mAmerican Airlines

Sat 8/236:35 amBSL - BWI

2 stops17h 19mAmerican Airlines

Deal found 7/29

$889

One-way flights from Washington, D.C. to Basel
Search for one-way flight options from Washington, D.C. to Basel. Find affordable one-way fares based on user searches. Data last updated July 31, 2025.

Mon 9/155:45 pmIAD - BSL

2 stops43h 15mMultiple Airlines

Deal found 7/28

$256

Fri 8/156:50 pmBWI - BSL

1 stop29h 10mMultiple Airlines

Deal found 7/31

$347

Fri 8/225:55 pmIAD - BSL

1 stop22h 55mBritish Airways

Deal found 7/30

$507

Fri 8/227:20 pmDCA - BSL

2 stops21h 30mBritish Airways

Deal found 7/30

$508

Sat 10/119:35 pmBWI - BSL

1 stop14h 50mBritish Airways

Deal found 7/31

$517

Sat 10/115:39 pmBWI - BSL

2 stops14h 31mDelta

Deal found 7/31

$538

Sat 10/116:40 pmIAD - BSL

2 stops18h 55mUnited Airlines

Deal found 7/30

$540

Wed 8/139:40 pmIAD - BSL

1 stop14h 20mTurkish Airlines

Deal found 7/31

$621

Mon 8/42:54 pmDCA - BSL

2 stops14h 06mMultiple Airlines

Deal found 7/31

$661

Cheapflights Fare Finder

Use the filters below to find and compare flights from Washington, D.C. to Basel EuroAirport Swiss that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Basel

IAD - BSL

IADBSL

Washington, D.C. Dulles Intl

Mon 9/1

1:30 pm-6:00 pm

1 stop22h 30m

Basel EuroAirport Swiss

Thu 9/18

6:55 pm-11:45 am

1 stop22h 50m

$529

BaltimoreBasel

BWI - BSL

BWIBSL

Baltimore/Washington

Mon 8/25

6:50 pm-6:00 am

1 stop29h 10m

Basel EuroAirport Swiss

Tue 9/9

9:20 pm-5:40 pm

1 stop26h 20m

$534

BaltimoreBasel

BWI - BSL

BWIBSL

Baltimore/Washington

Tue 12/2

8:35 pm-10:20 pm

1 stop19h 45m

Basel EuroAirport Swiss

Tue 12/9

11:00 am-6:45 pm

1 stop13h 45m

$601

Washington, D.C.Basel

DCA - BSL

DCABSL

Washington, D.C. Reagan-National

Mon 8/25

6:00 am-10:50 am

2 stops22h 50m

Basel EuroAirport Swiss

Tue 9/9

11:25 am-9:51 pm

2 stops16h 26m

$604

Washington, D.C.Basel

IAD - BSL

IADBSL

Washington, D.C. Dulles Intl

Mon 8/25

3:25 pm-7:55 am

1 stop10h 30m

Basel EuroAirport Swiss

Tue 9/9

11:25 am-11:13 am

2 stops29h 48m

$622

Washington, D.C.Basel

IAD - BSL

IADBSL

Washington, D.C. Dulles Intl

Mon 9/1

10:25 pm-7:35 pm

2 stops15h 10m

Basel EuroAirport Swiss

Thu 9/18

11:30 am-8:00 pm

1 stop14h 30m

$637

Washington, D.C.Basel

IAD - BSL

IADBSL

Washington, D.C. Dulles Intl

Tue 8/19

5:25 pm-9:40 am

1 stop34h 15m

Basel EuroAirport Swiss

Mon 9/1

8:25 pm-2:35 pm

1 stop24h 10m

$650

Washington, D.C.Basel

IAD - BSL

IADBSL

Washington, D.C. Dulles Intl

Fri 9/12

10:40 pm-10:50 pm

1 stop18h 10m

Basel EuroAirport Swiss

Fri 9/19

6:00 am-6:51 pm

2 stops18h 51m

$692

Washington, D.C.Basel

IAD - BSL

IADBSL

Washington, D.C. Dulles Intl

Fri 9/19

7:21 pm-10:50 pm

2 stops21h 29m

Basel EuroAirport Swiss

Thu 9/25

6:10 am-4:38 pm

2 stops16h 28m

$734

Washington, D.C.Basel

DCA - BSL

DCABSL

Washington, D.C. Reagan-National

Wed 8/13

1:44 pm-11:20 am

2 stops15h 36m

Basel EuroAirport Swiss

Sun 8/17

7:05 am-7:15 pm

2 stops18h 10m

$792

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Showing 1-10 of 26 results

Best time to book a flight from Washington, D.C. to Basel

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

No data available for this route at this time. Please check back soon.

Reviews of airlines servicing Basel

Peruse reviews from past customers who have flown with Delta, Austrian Airlines, and United Airlines from Washington, D.C. to Basel EuroAirport Swiss to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very good

7,981 reviews

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

7,981 reviews

Delta

8.0

Very good

7,981 reviews

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!

Austrian Airlines

7.6

Good

823 reviews

Delta

8.0

Very good

7,981 reviews

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

8,900 reviews

Delta

8.0

Very good

7,981 reviews

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!

Turkish Airlines

7.3

Good

3,933 reviews

Delta

8.0

Very good

7,981 reviews

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!

American Airlines

7.2

Good

10,000 reviews

Delta

8.0

Very good

7,981 reviews

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

What airport do you fly into for flights to Basel from Washington, D.C.?
For a flight from Washington, D.C. to Basel, you will be flying into EuroAirport Swiss. Basel EuroAirport Swiss (BSL) is just 3.6 mi from the center of the city. EuroAirport Swiss is the only Basel airport and it handles 0 inbound flights from Washington, D.C. per day. 1 airline has flights to Basel EuroAirport Swiss from Washington, D.C. on a regular basis.
What are the cheapest airlines flying from Washington, D.C. to Basel EuroAirport Swiss round-trip?
Flying on Turkish Airlines is currently your cheapest option to Basel EuroAirport Swiss, with prices starting at $566. Additional round-trip tickets that might be worth considering are offered by British Airways and American Airlines, with the lowest prices starting at $601 and $614, respectively.
What are the cheapest airlines to fly from Washington, D.C. to Basel EuroAirport Swiss one-way?
To fly one-way, consider booking your trip with British Airways, which is currently one of the cheapest options available, starting at $507. Delta flights start at $538 while deals on United Airlines start at $540 one-way.
What are the most popular routes from Washington, D.C. to Basel EuroAirport Swiss?
While some choose either Baltimore/Washington - Basel EuroAirport Swiss or Washington, D.C. Reagan-National - Basel EuroAirport Swiss, Washington, D.C. Dulles Intl - Basel EuroAirport Swiss is the most popular route from Washington, D.C. to Basel EuroAirport Swiss.
Can I find deals for flights from Washington, D.C. to Basel that include hotel bookings?
Yes. In addition to deals on Washington, D.C. to Basel flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Washington, D.C. to Basel?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington, D.C. to Basel.
Can I find deals for business class flights from Washington, D.C. to Basel?
Yes. Cheapflights offers flight deals from Washington, D.C. 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 Washington, D.C. to Basel EuroAirport Swiss?
Currently, January is the cheapest month in which you can book a flight from Washington, D.C. to Basel EuroAirport Swiss (average of $545). Flying from Washington, D.C. to Basel EuroAirport Swiss 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

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Alternative routes for Washington, D.C. to Basel

Dulles Intl to Basel flights

Reagan-National to Basel flights

Top airline flying from Washington, D.C. to Basel

Airline	Cheapest	Average	Flexibility	On-time
Turkish Airlines	Cheapest$530	Average$584	FlexibilityNo cancel fee	On-time77%

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$256+ Cheap flights from Washington, D.C. (WAS) 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 9/15. Fares are subject to change and may not be available on all flights or dates of travel.

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Find flight deals from Washington, D.C. to Basel

Cheapest flights from Washington, D.C. to BaselExplore the most affordable flight options available from Washington, D.C. to Basel. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 31, 2025.

Explore the most affordable flight options available from Washington, D.C. to Basel. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 31, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Washington, D.C. to Basel EuroAirport Swiss that are best for you.

Best time to book a flight from Washington, D.C. to Basel

Have a flexible travel schedule? Discover the best time to fly to Basel from Washington, D.C. with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. to Basel EuroAirport Swiss

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 31, 2025.

Related info for your journey

Find useful and relevant information for your journey from Washington, D.C. 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, D.C.?

What are the cheapest airlines flying from Washington, D.C. to Basel EuroAirport Swiss round-trip?

What are the cheapest airlines to fly from Washington, D.C. to Basel EuroAirport Swiss one-way?

What are the most popular routes from Washington, D.C. to Basel EuroAirport Swiss?

Can I find deals for flights from Washington, D.C. to Basel that include hotel bookings?

How can I find direct flights from Washington, D.C. to Basel?

Can I find deals for business class flights from Washington, D.C. to Basel?

What is the cheapest month to book a flight from Washington, D.C. to Basel EuroAirport Swiss?

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Washington, D.C. to Basel

See prices for flight routes from nearby airports that may be better suited for you.

Top airline flying from Washington, D.C. to Basel

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Cheapest flights from Washington, D.C. to Basel
Explore the most affordable flight options available from Washington, D.C. to Basel. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 31, 2025.