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

Airlines like Virgin Atlantic and KLM fly from Cardiff to Washington, D.C. Dulles Intl Airport in about 18h 03m. The time it takes to get you to your destination can typically vary by up to 9h 22m. There are 3548 mi between Cardiff and Washington, D.C. Dulles Intl Airport. Both multi-stop and direct flights can be found to your destination and back.

In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 66.0 - 102.0 inches per month. May is typically the wettest month, when rainfall can reach 102.0 mm. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 66.0 mm.

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 27.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 2.0 C).

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.

What airport do you fly from for flights from Cardiff to Washington, D.C. Dulles Intl?

For a flight from Cardiff to Washington, D.C. Dulles Intl, you will be flying from Cardiff Wales. Cardiff Wales (CWL) is just 9.1 mi from the center of the city. Cardiff Wales is the only Cardiff airport and it handles 0 outbound flights to Washington, D.C. Dulles Intl per day. 0 airlines have flights to Washington, D.C. Dulles Intl from Cardiff Wales on a regular basis.

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 holiday 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.

£644+ Cheap Flights from Cardiff to Washington, D.C. Dulles Intl Airport

Cheap flight deals from Cardiff to Dulles Intl

Enter your travel dates to find the best prices.

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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 23 October 2026.

Sat 5/1208:15 -

2 stops15h 15m

Sat 12/1219:40 -

2 stops13h 15m

Deal found 21/10£644

Fri 4/1217:30 -

1 stop27h 25m

Fri 11/1218:15 -

1 stop10h 35m

Deal found 20/10£697

Fri 4/1210:20 -

2 stops18h 03m

Fri 11/1218:15 -

1 stop10h 35m

Deal found 20/10£703

Wed 18/1117:30 -

1 stop27h 25m

Wed 25/1118:15 -

1 stop10h 30m

Deal found 21/10£712

Fri 4/1216:05 -

2 stops29h 55m

Fri 11/1216:30 -

3 stops19h 30m

Deal found 20/10£824

Wed 18/1117:30 -

3 stops30h 00m

Wed 25/1119:40 -

2 stops12h 20m

Deal found 21/10£848

Find flight deals from Cardiff to Dulles Intl

Round-trip from	£644

5/12-12/12
4 total stops
28h 30m total
Cardiff to Washington, D.C.

Search Deals

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.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

CardiffWashington, D.C.

CWL Cardiff Wales - IAD Washington, D.C. Dulles Intl

CWLIAD

Cardiff Wales

Sat 5/12

08:15-15:45

1 stop12h 30m

Washington, D.C. Dulles Intl

Sat 12/12

20:50-13:55

1 stop12h 05m

£658

CardiffWashington, D.C.

CWL Cardiff Wales - IAD Washington, D.C. Dulles Intl

CWLIAD

Cardiff Wales

Fri 4/12

17:30-15:55

1 stop27h 25m

Washington, D.C. Dulles Intl

Fri 11/12

18:15-09:50

1 stop10h 35m

£697

CardiffWashington, D.C.

CWL Cardiff Wales - IAD Washington, D.C. Dulles Intl

CWLIAD

Cardiff Wales

Fri 4/12

10:20-23:23

2 stops18h 03m

Washington, D.C. Dulles Intl

Fri 11/12

18:15-09:50

1 stop10h 35m

£703

CardiffWashington, D.C.

CWL Cardiff Wales - IAD Washington, D.C. Dulles Intl

CWLIAD

Cardiff Wales

Wed 13/1

10:20-23:02

2 stops17h 42m

Washington, D.C. Dulles Intl

Sat 16/1

18:15-09:45

1 stop10h 30m

£720

CardiffWashington, D.C.

CWL Cardiff Wales - IAD Washington, D.C. Dulles Intl

CWLIAD

Cardiff Wales

Wed 18/11

17:30-17:28

2 stops28h 58m

Washington, D.C. Dulles Intl

Wed 25/11

18:20-17:00

2 stops17h 40m

£730

CardiffWashington, D.C.

CWL Cardiff Wales - IAD Washington, D.C. Dulles Intl

CWLIAD

Cardiff Wales

Wed 18/11

17:30-18:30

3 stops30h 00m

Washington, D.C. Dulles Intl

Wed 25/11

19:40-13:00

2 stops12h 20m

£848

CardiffWashington, D.C.

CWL Cardiff Wales - IAD Washington, D.C. Dulles Intl

CWLIAD

Cardiff Wales

Fri 4/12

10:20-00:41

2 stops19h 21m

Washington, D.C. Dulles Intl

Fri 11/12

18:40-17:00

2 stops17h 20m

£859

Fastest return journey

CardiffWashington, D.C.

CWL Cardiff Wales - IAD Washington, D.C. Dulles Intl

CWLIAD

Cardiff Wales

Fri 20/11

10:20-00:41

2 stops19h 21m

Washington, D.C. Dulles Intl

Wed 31/12

00:00-06:00

Nonstop0h 00m

£868

CardiffWashington, D.C.

CWL Cardiff Wales - IAD Washington, D.C. Dulles Intl

CWLIAD

Cardiff Wales

Fri 20/11

17:30-15:55

1 stop27h 25m

Washington, D.C. Dulles Intl

Wed 31/12

00:00-06:00

Nonstop0h 00m

£1,313

CardiffWashington, D.C.

CWL Cardiff Wales - IAD Washington, D.C. Dulles Intl

CWLIAD

Cardiff Wales

Wed 16/12

10:20-15:15

3 stops33h 55m

Washington, D.C. Dulles Intl

Sat 19/12

17:15-17:00

3 stops18h 45m

£1,543

Flights are sorted by cheapest return flights first.

Deals found on 19/10

Sorted by cheapest first

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.

CWL-IAD

Estimated return 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.

Related info for your journey

What airport do you fly from for flights from Cardiff to Washington, D.C. Dulles Intl?
For a flight from Cardiff to Washington, D.C. Dulles Intl, you will be flying from Cardiff Wales. Cardiff Wales (CWL) is just 9.1 mi from the center of the city. Cardiff Wales is the only Cardiff airport and it handles 0 outbound flights to Washington, D.C. Dulles Intl per day. 0 airlines have flights to Washington, D.C. Dulles Intl from Cardiff Wales on a regular basis.
How long is the flight from Cardiff to Washington, D.C. Dulles Intl Airport?
Airlines like Virgin Atlantic and KLM fly from Cardiff to Washington, D.C. Dulles Intl Airport in about 18h 03m. The time it takes to get you to your destination can typically vary by up to 9h 22m. There are 3548 mi between Cardiff and Washington, D.C. Dulles Intl Airport. Both multi-stop and direct flights can be found to your destination and back.
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 holiday 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.

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Cheap flights from Cardiff to Washington, D.C. Dulles Intl Airport from £644

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/12. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap 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 23 October 2026.

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 23 October 2026.

Best flights from Cardiff to Dulles IntlDiscover carefully curated flight deals from Cardiff to Dulles Intl that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 23 October 2026.

Discover carefully curated flight deals from Cardiff to Dulles Intl that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 23 October 2026.

Last-minute flights from Cardiff to Dulles IntlDiscover last-minute flight deals from Cardiff to Dulles Intl. Data last updated 23 October 2026 and is based on user searches.

Discover last-minute flight deals from Cardiff to Dulles Intl. Data last updated 23 October 2026 and is based on user searches.

One-way flights from Cardiff to Dulles IntlSearch for one-way flight options from Cardiff to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated 23 October 2026.

Search for one-way flight options from Cardiff to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated 23 October 2026.

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Related info for your journey

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?

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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 23 October 2026.

Best flights from Cardiff to Dulles Intl
Discover carefully curated flight deals from Cardiff to Dulles Intl that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 23 October 2026.

Last-minute flights from Cardiff to Dulles Intl
Discover last-minute flight deals from Cardiff to Dulles Intl. Data last updated 23 October 2026 and is based on user searches.

One-way flights from Cardiff to Dulles Intl
Search for one-way flight options from Cardiff to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated 23 October 2026.