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

Airlines like KLM fly from Cardiff to Washington, D.C. Dulles Intl Airport in about 27h 15m. The time it takes to get you to your destination can typically vary by up to . There are 3548 mi between Cardiff and Washington, D.C. Dulles Intl Airport.

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.

£641+ 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 12 October 2026.

Mon 23/1117:30 -

1 stop27h 15m

Mon 30/1118:15 -

1 stop10h 30m

Deal found 9/10£641

Thu 26/1117:30 -

1 stop27h 25m

Thu 3/1217:45 -

1 stop11h 05m

Deal found 12/10£643

Thu 26/1117:30 -

2 stops30h 35m

Thu 3/1220:50 -

1 stop30h 00m

Deal found 12/10£648

Thu 5/1117:30 -

1 stop27h 25m

Thu 12/1112:35 -

2 stops16h 15m

Deal found 8/10£659

Thu 5/1110:20 -

2 stops17h 56m

Thu 12/1112:35 -

2 stops16h 15m

Deal found 8/10£663

Sat 7/1110:20 -

2 stops17h 56m

Mon 9/1118:15 -

1 stop17h 45m

Deal found 9/10£666

Sun 22/1117:30 -

1 stop27h 25m

Sun 29/1117:45 -

1 stop11h 05m

Deal found 8/10£681

Thu 5/1117:30 -

1 stop27h 25m

Thu 12/1118:15 -

1 stop10h 35m

Deal found 8/10£688

Find flight deals from Cardiff to Dulles Intl

Round-trip from	£641

KLM
23/11-30/11
2 total stops
37h 45m total
Cardiff to Washington, D.C.

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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.

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Route

Depart

Return

Price

Cheapest return flight

CardiffWashington, D.C.

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

CWLIAD

Cardiff Wales

Mon 23/11

17:30-15:45

1 stop27h 15m

Washington, D.C. Dulles Intl

Mon 30/11

18:15-09:45

1 stop10h 30m

£641

CardiffWashington, D.C.

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

CWLIAD

Cardiff Wales

Thu 26/11

17:30-15:55

1 stop27h 25m

Washington, D.C. Dulles Intl

Thu 3/12

17:45-09:50

1 stop11h 05m

£643

CardiffWashington, D.C.

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

CWLIAD

Cardiff Wales

Thu 26/11

17:30-19:05

2 stops30h 35m

Washington, D.C. Dulles Intl

Thu 3/12

20:50-07:50

1 stop30h 00m

£648

CardiffWashington, D.C.

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

CWLIAD

Cardiff Wales

Thu 5/11

17:30-15:55

1 stop27h 25m

Washington, D.C. Dulles Intl

Thu 12/11

12:35-09:50

2 stops16h 15m

£659

CardiffWashington, D.C.

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

CWLIAD

Cardiff Wales

Thu 26/11

10:20-10:57

2 stops29h 37m

Washington, D.C. Dulles Intl

Thu 3/12

18:20-17:00

2 stops17h 40m

£663

Fastest return journey

CardiffWashington, D.C.

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

CWLIAD

Cardiff Wales

Thu 5/11

10:20-23:16

2 stops17h 56m

Washington, D.C. Dulles Intl

Thu 12/11

12:35-09:50

2 stops16h 15m

£663

CardiffWashington, D.C.

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

CWLIAD

Cardiff Wales

Sat 7/11

10:20-23:16

2 stops17h 56m

Washington, D.C. Dulles Intl

Mon 9/11

19:37-17:00

2 stops16h 23m

£669

CardiffWashington, D.C.

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

CWLIAD

Cardiff Wales

Sun 22/11

17:30-15:55

1 stop27h 25m

Washington, D.C. Dulles Intl

Sun 29/11

17:45-09:50

1 stop11h 05m

£681

CardiffWashington, D.C.

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

CWLIAD

Cardiff Wales

Mon 23/11

08:35-18:30

2 stops14h 55m

Washington, D.C. Dulles Intl

Mon 30/11

19:40-09:50

3 stops33h 10m

£720

CardiffWashington, D.C.

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

CWLIAD

Cardiff Wales

Sun 22/11

10:20-00:41

2 stops19h 21m

Washington, D.C. Dulles Intl

Sun 29/11

18:20-17:00

2 stops17h 40m

£826

Flights are sorted by cheapest return flights first.

Deals found on 9/10

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 KLM fly from Cardiff to Washington, D.C. Dulles Intl Airport in about 27h 15m. The time it takes to get you to your destination can typically vary by up to . There are 3548 mi between Cardiff and Washington, D.C. Dulles Intl Airport.
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 £641

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 23/11. 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 12 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 12 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 12 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 12 October 2026.

Last-minute flights from Cardiff to Dulles IntlDiscover last-minute flight deals from Cardiff to Dulles Intl. Data last updated 12 October 2026 and is based on user searches.

Discover last-minute flight deals from Cardiff to Dulles Intl. Data last updated 12 October 2026 and is based on user searches.

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Best time to book a flight from Cardiff to Dulles Intl

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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 12 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 12 October 2026.

Last-minute flights from Cardiff to Dulles Intl
Discover last-minute flight deals from Cardiff to Dulles Intl. Data last updated 12 October 2026 and is based on user searches.