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

There are many flights that can get you from Cardiff to Washington, D.C. in 17h 42m. Fly via KLM or Delta to get the fastest option. Airlines will cover a distance of 3548 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

In terms of precipitation, rainfall in Washington, D.C. 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. when rainfall is around 66.0 mm.

If weather is an important factor for your trip to Washington, D.C., 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 are the most popular routes from Cardiff to Washington, D.C.?

The most popular route from Cardiff to Washington, D.C. is Cardiff Wales - Washington, D.C. Dulles Intl. You may also consider Cardiff Wales - Washington, D.C. Reagan-National or Cardiff Wales - Baltimore/Washington.

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

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Cardiff to Washington, D.C. as you normally would.

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

Cardiff Wales (CWL), located 9.1 mi from the city center, is the airport you fly out of when you book flights from Cardiff to Washington, D.C.. 0 airlines have flights from Cardiff Wales to Washington, D.C. on a regular basis. Booking flights from Cardiff Wales to Washington, D.C. should not be difficult; the airport handles an average of 0 outbound flights to Washington, D.C. per day.

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

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

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

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

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

Yes. Cheapflights offers flight deals from Cardiff to Washington, D.C. by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

£368+ Cheap Flights from Cardiff to Washington, D.C.

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

Enter your travel dates to find the best prices.

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Cheapest flights from Cardiff to Washington, D.C.
Explore the most affordable flight options available from Cardiff to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 26 October 2026.

Sat 5/1208:15 -

2 stops15h 15m

Sat 12/1219:40 -

2 stops13h 15m

Deal found 21/10£645

Wed 18/1117:30 -

1 stop27h 25m

Wed 25/1118:15 -

1 stop10h 30m

Deal found 21/10£712

Mon 23/1117:30 -

1 stop27h 15m

Mon 30/1118:15 -

1 stop10h 30m

Deal found 25/10£713

Mon 23/1110:20 -

2 stops19h 21m

Mon 30/1118:15 -

1 stop17h 45m

Deal found 25/10£732

Mon 23/1108:35 -

2 stops14h 55m

Mon 30/1119:40 -

3 stops33h 10m

Deal found 25/10£747

Sat 21/1107:55 -

2 stops40h 10m

Sat 28/1117:15 -

1 stop15h 40m

Deal found 24/10£750

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

Round-trip from	£645
One-way from	£368

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

Search Deals

20/12-31/12
3 total stops
34h 40m 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. 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

Sun 20/12

09:05-14:45

3 stops34h 40m

Washington, D.C. Dulles Intl

Wed 31/12

00:00-06:00

Nonstop0h 00m

£368

Fastest return journey

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

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

£721

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

12:35-09:45

2 stops16h 10m

£728

CardiffWashington, D.C.

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

CWLIAD

Cardiff Wales

Mon 23/11

10:20-00:41

2 stops19h 21m

Washington, D.C. Dulles Intl

Mon 30/11

18:15-17:00

1 stop17h 45m

£732

CardiffWashington, D.C.

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

CWLIAD

Cardiff Wales

Sat 21/11

07:55-19:05

2 stops40h 10m

Washington, D.C. Dulles Intl

Sat 28/11

17:15-13:55

1 stop15h 40m

£750

CardiffWashington, D.C.

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

CWLIAD

Cardiff Wales

Sun 20/12

17:30-15:55

1 stop27h 25m

Washington, D.C. Dulles Intl

Tue 12/1

12:49-09:50

2 stops16h 01m

£778

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

£849

CardiffWashington, D.C.

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

CWLIAD

Cardiff Wales

Sat 21/11

10:20-00:41

2 stops19h 21m

Washington, D.C. Dulles Intl

Sat 28/11

12:32-09:50

2 stops16h 18m

£861

CardiffWashington, D.C.

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

CWLIAD

Cardiff Wales

Mon 23/11

17:30-18:30

3 stops30h 00m

Washington, D.C. Dulles Intl

Mon 30/11

19:40-09:50

3 stops33h 10m

£880

Flights are sorted by cheapest return flights first.

Deals found on 25/10

Sorted by cheapest first

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

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

CWL-WAS

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.

Cheapflights Insights

Everything you need to know about your flight from Cardiff to Washington, D.C.

CWL-WAS

CWL-IAD

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

Related info for your journey

What airport do you fly from for flights from Cardiff to Washington, D.C.?
Cardiff Wales (CWL), located 9.1 mi from the city center, is the airport you fly out of when you book flights from Cardiff to Washington, D.C.. 0 airlines have flights from Cardiff Wales to Washington, D.C. on a regular basis. Booking flights from Cardiff Wales to Washington, D.C. should not be difficult; the airport handles an average of 0 outbound flights to Washington, D.C. per day.
How long is the flight from Cardiff to Washington, D.C.?
There are many flights that can get you from Cardiff to Washington, D.C. in 17h 42m. Fly via KLM or Delta to get the fastest option. Airlines will cover a distance of 3548 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.
What are the most popular routes from Cardiff to Washington, D.C.?
The most popular route from Cardiff to Washington, D.C. is Cardiff Wales - Washington, D.C. Dulles Intl. You may also consider Cardiff Wales - Washington, D.C. Reagan-National or Cardiff Wales - Baltimore/Washington.
Can I find deals for flights from Cardiff to Washington, D.C. that include hotel bookings?
Yes. In addition to deals on Cardiff to Washington, D.C. flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Cardiff to Washington, D.C.?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Cardiff to Washington, D.C..
Can I find deals for business class flights from Cardiff to Washington, D.C.?
Yes. Cheapflights offers flight deals from Cardiff to Washington, D.C. 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. from £368

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 20/12. Fares are subject to change and may not be available on all flights or dates of travel.

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

Cheapest flights from Cardiff to Washington, D.C.Explore the most affordable flight options available from Cardiff to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 26 October 2026.

Explore the most affordable flight options available from Cardiff to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 26 October 2026.

Best flights from Cardiff to Washington, D.C.Discover carefully curated flight deals from Cardiff to Washington, D.C. that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 26 October 2026.

Discover carefully curated flight deals from Cardiff to Washington, D.C. that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 26 October 2026.

Last-minute flights from Cardiff to Washington, D.C.Discover last-minute flight deals from Cardiff to Washington, D.C.. Data last updated 26 October 2026 and is based on user searches.

Discover last-minute flight deals from Cardiff to Washington, D.C.. Data last updated 26 October 2026 and is based on user searches.

One-way flights from Cardiff to Washington, D.C.Search for one-way flight options from Cardiff to Washington, D.C.. Find affordable one-way fares based on user searches. Data last updated 26 October 2026.

Search for one-way flight options from Cardiff to Washington, D.C.. Find affordable one-way fares based on user searches. Data last updated 26 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.?

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

What are the most popular routes from Cardiff to Washington, D.C.?

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

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

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

Travelling to a place near Washington, D.C.?

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Cardiff and Washington, D.C. flights

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Cardiff to Washington, D.C. flights

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Cheapest flights from Cardiff to Washington, D.C.
Explore the most affordable flight options available from Cardiff to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 26 October 2026.

Best flights from Cardiff to Washington, D.C.
Discover carefully curated flight deals from Cardiff to Washington, D.C. that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 26 October 2026.

Last-minute flights from Cardiff to Washington, D.C.
Discover last-minute flight deals from Cardiff to Washington, D.C.. Data last updated 26 October 2026 and is based on user searches.

One-way flights from Cardiff to Washington, D.C.
Search for one-way flight options from Cardiff to Washington, D.C.. Find affordable one-way fares based on user searches. Data last updated 26 October 2026.