What are the cheapest airlines flying from Cardiff to Washington, D.C. Dulles Intl Airport round-trip?

According to our current data, KLM ($1,181), Delta ($1,187), and Virgin Atlantic ($1,200) offers the cheapest pricing from Cardiff to Washington, D.C. Dulles Intl Airport.

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.

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.

$919+ Flights from Cardiff to Washington, D.C. Dulles Intl Airport

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Cheap flight deals from Cardiff to Dulles Intl

Round-trip from	$919 (Trip.com)

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

Search Deals

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 July 1, 2025.

Wed 8/138:30 pmCWL - IAD

2 stops23h 50mMultiple Airlines

Wed 8/205:50 pmIAD - CWL

2 stops20h 50mMultiple Airlines

Deal found 6/29

$919

Tue 7/295:15 pmCWL - IAD

1 stop27h 20mKLM

Tue 8/55:25 pmIAD - CWL

1 stop10h 50mKLM

Deal found 6/30

$1,181

Tue 7/299:50 amCWL - IAD

2 stops15h 01mDelta

Tue 8/512:45 pmIAD - CWL

2 stops15h 30mDelta

Deal found 6/30

$1,187

Wed 8/135:15 pmCWL - IAD

1 stop27h 20mVirgin Atlantic

Wed 8/205:25 pmIAD - CWL

1 stop10h 50mVirgin Atlantic

Deal found 6/29

$1,200

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 July 1, 2025.

Wed 8/138:30 pmCWL - IAD

2 stops23h 50mMultiple Airlines

Wed 8/205:50 pmIAD - CWL

2 stops20h 50mMultiple Airlines

Deal found 6/29

$919

Tue 7/295:15 pmCWL - IAD

1 stop27h 20mKLM

Tue 8/55:25 pmIAD - CWL

1 stop10h 50mKLM

Deal found 6/30

$1,181

Tue 7/299:50 amCWL - IAD

2 stops15h 01mDelta

Tue 8/512:45 pmIAD - CWL

2 stops15h 30mDelta

Deal found 6/30

$1,187

Wed 8/135:15 pmCWL - IAD

1 stop27h 20mVirgin Atlantic

Wed 8/205:25 pmIAD - CWL

1 stop10h 50mVirgin Atlantic

Deal found 6/29

$1,200

Last-minute flights from Cardiff to Dulles Intl
Discover last-minute flight deals from Cardiff to Dulles Intl. Data last updated July 1, 2025 and is based on user searches.

Tue 7/294:20 pmCWL - IAD

2 stops32h 00mMultiple Airlines

Tue 8/59:00 pmIAD - CWL

1 stop29h 25mMultiple Airlines

Deal found 6/30

$1,142

Tue 7/295:15 pmCWL - IAD

1 stop27h 20mKLM

Tue 8/55:25 pmIAD - CWL

1 stop10h 50mKLM

Deal found 6/30

$1,181

Tue 7/299:50 amCWL - IAD

2 stops15h 01mDelta

Tue 8/512:45 pmIAD - CWL

2 stops15h 30mDelta

Deal found 6/30

$1,187

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

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Wed 8/13

8:30 pm-3:20 pm

2 stops23h 50m

Washington, D.C. Dulles Intl

Wed 8/20

5:50 pm-7:40 pm

2 stops20h 50m

$919

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Tue 7/29

5:15 pm-3:35 pm

1 stop27h 20m

Washington, D.C. Dulles Intl

Tue 8/5

5:25 pm-9:15 am

1 stop10h 50m

$1,181

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Tue 7/29

9:50 am-7:51 pm

2 stops15h 01m

Washington, D.C. Dulles Intl

Tue 8/5

12:45 pm-9:15 am

2 stops15h 30m

$1,187

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Wed 8/13

5:15 pm-3:35 pm

1 stop27h 20m

Washington, D.C. Dulles Intl

Wed 8/20

5:25 pm-9:15 am

1 stop10h 50m

$1,200

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/29

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, August is the cheapest month in which you can book a flight from Cardiff to Washington, D.C. Dulles Intl Airport (average of $309). Flying from Cardiff to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $345). 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.

Reviews of airlines servicing Dulles Intl

Read reviews from past customers who have flown Delta, KLM, and Virgin Atlantic from Cardiff to Washington, D.C. Dulles Intl Airport. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very good

7,973 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Delta

8.0

Very good

7,973 reviews

Delta

8.0

Very good

7,973 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

KLM

7.8

Good

1,366 reviews

Delta

8.0

Very good

7,973 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Virgin Atlantic

7.4

Good

654 reviews

Delta

8.0

Very good

7,973 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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.
What are the cheapest airlines flying from Cardiff to Washington, D.C. Dulles Intl Airport round-trip?
According to our current data, KLM ($1,181), Delta ($1,187), and Virgin Atlantic ($1,200) offers the cheapest pricing from Cardiff to 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 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, August is the cheapest month in which you can book a flight from Cardiff to Washington, D.C. Dulles Intl Airport (average of $309). Flying from Cardiff to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $345). 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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$919+ 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 8/13. 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

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Cardiff to Dulles Intl

Round-trip from

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 July 1, 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 July 1, 2025.

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?

Reviews of airlines servicing Dulles Intl

Read reviews from past customers who have flown Delta, KLM, and Virgin Atlantic from Cardiff to Washington, D.C. Dulles Intl Airport. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

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?

What are the cheapest airlines flying from Cardiff to Washington, D.C. Dulles Intl Airport round-trip?

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 Cardiff?

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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 July 1, 2025.