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

Airlines like KLM and Delta fly from Cardiff to Washington, D.C. Dulles Intl Airport in about 27h 35m. The time it takes to get you to your destination can typically vary by up to 2h 48m. The distance between Cardiff and Washington, D.C. Dulles Intl Airport is about 3548 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 2.6 in.

If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, 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 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

What is the cheapest time of day to fly from CWL to IAD?

When flying from Cardiff to Washington, D.C. Dulles Intl Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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.

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.

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.

$1,013+ Flights from Cardiff to Washington, D.C. Dulles Intl Airport

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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 November 20, 2025.

Wed 12/1712:00 pmCWL - IAD

2 stops32h 35mBritish Airways

Wed 12/319:45 pmIAD - CWL

2 stops29h 20mBritish Airways

Deal found 11/18

$1,908

Best flights from Cardiff to Dulles Intl
Discover carefully curated flight deals from Cardiff to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 20, 2025.

Sun 3/15:30 pmCWL - IAD

1 stop27h 35mKLM

Sun 3/87:05 pmIAD - CWL

1 stop10h 45mKLM

Deal found 11/19

$1,013

Thu 2/2610:20 amCWL - IAD

2 stops30h 23mDelta

Mon 3/26:05 pmIAD - CWL

1 stop10h 45mDelta

Deal found 11/19

$1,054

Thu 2/2610:20 amCWL - IAD

2 stops33h 27mVirgin Atlantic

Mon 3/27:07 pmIAD - CWL

2 stops16h 48mVirgin Atlantic

Deal found 11/17

$1,058

Sat 1/38:05 pmCWL - IAD

1 stop24h 30mMultiple Airlines

Sat 1/105:30 pmIAD - CWL

2 stops22h 25mMultiple Airlines

Deal found 11/19

$1,371

Thu 2/265:25 pmCWL - IAD

1 stop27h 40mKLM

Mon 3/26:05 pmIAD - CWL

1 stop10h 45mKLM

Deal found 11/17

$1,108

Last-minute flights from Cardiff to Dulles Intl
Discover last-minute flight deals from Cardiff to Dulles Intl. Data last updated November 20, 2025 and is based on user searches.

Wed 12/1712:00 pmCWL - IAD

2 stops32h 35mBritish Airways

Wed 12/319:45 pmIAD - CWL

2 stops29h 20mBritish Airways

Deal found 11/18

$1,908

Cheap flight deals from Cardiff to Dulles Intl

Most accurate provider	Expedia 2 stars
Most trusted provider	Expedia 3 stars
Round-trip from	$1,013 (KLM)

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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From Cardiff Wales to Washington, D.C. Dulles Intl

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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

Fly to

Route

Depart

Return

Price

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Sun 3/1

5:30 pm-4:05 pm

1 stop27h 35m

Washington, D.C. Dulles Intl

Sun 3/8

7:05 pm-9:50 am

1 stop10h 45m

$1,013

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Thu 2/26

10:20 am-11:43 am

2 stops30h 23m

Washington, D.C. Dulles Intl

Mon 3/2

6:05 pm-9:50 am

1 stop10h 45m

$1,054

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Thu 2/26

10:20 am-2:47 pm

2 stops33h 27m

Washington, D.C. Dulles Intl

Mon 3/2

7:07 pm-4:55 pm

2 stops16h 48m

$1,058

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Thu 2/26

5:25 pm-4:05 pm

1 stop27h 40m

Washington, D.C. Dulles Intl

Mon 3/2

6:05 pm-9:50 am

1 stop10h 45m

$1,108

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Sat 1/3

8:05 pm-3:35 pm

1 stop24h 30m

Washington, D.C. Dulles Intl

Sat 1/10

5:30 pm-8:55 pm

2 stops22h 25m

$1,371

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/19

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 $688). Flying from Cardiff to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $1,078). 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

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 KLM and Delta fly from Cardiff to Washington, D.C. Dulles Intl Airport in about 27h 35m. The time it takes to get you to your destination can typically vary by up to 2h 48m. The distance between Cardiff and Washington, D.C. Dulles Intl Airport is about 3548 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.
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 $688). Flying from Cardiff to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $1,078). 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.

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$1,013+ 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 3/1. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Cardiff to Dulles Intl with Cheapflights

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2. Select your favorite providers

3. Compare prices and book

Find flight deals from Cardiff to Dulles Intl

Cheapest flights from Cardiff to Dulles IntlExplore 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 November 20, 2025.

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 November 20, 2025.

Cheap flight deals from Cardiff to Dulles Intl

Most accurate provider

Most trusted provider

Round-trip from

Cheapflights Fare Finder

Use the filters below to find and compare flights from Cardiff to Washington, D.C. Dulles Intl Airport that are best for you.

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.

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?

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?

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

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

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

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

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

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

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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 November 20, 2025.