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Dulles Intl

$740+ Cheap flights from Cardiff (CWL) to Dulles Intl (IAD)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/7. Fares are subject to change and may not be available on all flights or dates of travel.
CWL — IAD
Feb 5 — Feb 121
Thu 2/5
Thu 2/12
1 adult, Economy
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Cheap flight deals from Cardiff to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from Cardiff (CWL) to Dulles Intl (IAD). 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 January 6, 2026.

Most accurate provider

Expedia
2 stars

Most trusted provider

Expedia
3 stars
Provider with most accurate pricing for Cardiff Wales-Washington, D.C. Dulles Intl flight deals.
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Provider most trusted by Cheapflights users for Cardiff Wales-Washington, D.C. Dulles Intl flights.
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Find flight deals from Cardiff to Dulles Intl

Cheapest flights from Cardiff to Dulles Intl
Explore the most affordable flight options available from Cardiff to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 6, 2026.

This KLM deal was found by Cheapflights users on 1/4. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/710:20 amCWL - IAD
2 stops13h 49mMultiple Airlines
Sat 2/146:50 pmIAD - CWL
1 stop20h 20mMultiple Airlines
Deal found 1/4$740
This Delta deal was found by Cheapflights users on 1/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/710:20 amCWL - IAD
2 stops17h 46mDelta
Sat 2/145:13 pmIAD - CWL
2 stops18h 37mDelta
Deal found 1/4$746
This Expedia deal was found by Cheapflights users on 1/4. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/79:45 amCWL - IAD
1 stop10h 50mKLM
Wed 4/226:10 pmIAD - CWL
1 stop10h 05mKLM
Deal found 1/4$764
This Air France deal was found by Cheapflights users on 1/4. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/79:45 amCWL - IAD
2 stops18h 14mMultiple Airlines
Wed 4/221:19 pmIAD - CWL
2 stops14h 56mMultiple Airlines
Deal found 1/4$820

Cheapflights Fare Finder

 
Customize your flight search to find flights from Cardiff to Dulles Intl 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 January 6, 2026.
Use the filters below to find and compare flights from Cardiff to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Cardiff

Fly to

Dulles Intl

Route

Depart

Return

Price

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Sat 2/7

10:20 am-7:09 pm

2 stops13h 49m

Washington, D.C. Dulles Intl

Sat 2/14

6:50 pm-8:10 pm

1 stop20h 20m

$740

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Sat 2/7

10:20 am-11:06 pm

2 stops17h 46m

Washington, D.C. Dulles Intl

Sat 2/14

5:13 pm-4:50 pm

2 stops18h 37m

$746

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Tue 4/7

9:45 am-10:59 pm

2 stops18h 14m

Washington, D.C. Dulles Intl

Wed 4/22

1:19 pm-9:15 am

2 stops14h 56m

$820

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Tue 1/13

10:20 am-11:37 pm

2 stops42h 17m

$1,659

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Mon 1/12

10:20 am-7:09 pm

2 stops37h 49m

$1,659

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Wed 1/14

10:20 am-1:59 pm

2 stops32h 39m

$1,659

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Thu 1/15

10:20 am-8:37 pm

2 stops39h 17m

$1,715

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Fri 1/16

10:20 am-7:09 pm

2 stops37h 49m

$1,715

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Sat 1/17

10:20 am-11:44 am

2 stops54h 24m

$1,715

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/4

  • Most accurate provider: When it comes to deals on Cardiff-Washington, D.C. Dulles Intl Airport flights, users find the pricing of Expedia to be most consistent on Cheapflights vs. Expedia Users can find the same prices on Cardiff-Washington, D.C. Dulles Intl Airport flight deals on Cheapflights vs. Expedia 90-95% of the time. Price accuracy is based on data collected from Cardiff-Washington, D.C. Dulles Intl Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Cardiff-Washington, D.C. Dulles Intl Airport flights, Cheapflights users trust Expedia the most. Expedia has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Cardiff-Washington, D.C. Dulles Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Cardiff to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Cardiff 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 Cardiff to Washington, D.C. Dulles Intl Airport

What is the cheapest month to book a flight from Cardiff to Washington, D.C. Dulles Intl Airport?

Currently, November is the cheapest month in which you can book a flight from Cardiff to Washington, D.C. Dulles Intl Airport (average of $687). Flying from Cardiff to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $1,082). 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 Cardiff to Dulles Intl. 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 from for flights from Cardiff to Washington, D.C. Dulles Intl?

    Cardiff Wales (CWL) is the airport you will fly out of if you book a flight from Cardiff to Washington, D.C. Dulles Intl. You should not have trouble finding flights to Washington, D.C. Dulles Intl from Cardiff Wales; the airport handles an average of 0 outbound flights to Washington, D.C. Dulles Intl per day. You should also have plenty of airline options to choose from since 0 airlines have flights from the Cardiff airport to Washington, D.C. Dulles Intl. It is only a 9.1 mi journey to Cardiff Wales (CWL) from Cardiff’s city center.

  • How long is the flight from Cardiff to Washington, D.C. Dulles Intl Airport?

    Airlines like Delta fly from Cardiff to Washington, D.C. Dulles Intl Airport in about 17h 46m. The time it takes to get you to your destination can typically vary by up to . The distance between Cardiff and Washington, D.C. Dulles Intl Airport is about 3548 mi.

  • Can I find deals for flights from Cardiff to Dulles Intl that include hotel bookings?

    Yes. In addition to deals on Cardiff to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Cardiff to Dulles Intl?

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

  • Can I find deals for business class flights from Cardiff to Dulles Intl?

    Yes. Cheapflights offers flight deals from Cardiff to Dulles Intl 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 Cardiff to Washington, D.C. Dulles Intl Airport?

    Currently, November is the cheapest month in which you can book a flight from Cardiff to Washington, D.C. Dulles Intl Airport (average of $687). Flying from Cardiff to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $1,082). 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

Traveling to a place near Washington, D.C. Dulles Intl Airport?

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Alexandria
Woodbridge
Tysons
Arlington
Owings Mills
Springfield
Silver Spring
Hanover
Fredericksburg
Linthicum Heights
Rockville
Laurel
Towson
Manassas
National Harbor
Bowie
Largo
McLean
Clinton
Upper Marlboro

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Alternative routes for Cardiff to Dulles Intl

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