In terms of precipitation, rainfall in Cardiff ranges from 2.0 - 3.5 inches per month. January is typically the wettest month, when rainfall can reach 3.5 in. April is typically the driest time to visit Cardiff when rainfall is around 2.0 in.

If weather is an important factor for your trip to Cardiff, 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 64.4 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 39.2 F).

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

When flying from Washington, D.C. Dulles Intl Airport to Cardiff, 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 Washington, D.C. Dulles Intl Airport-Cardiff flights, users find the pricing of Ovago to be most consistent on Cheapflights vs. Ovago Users can find the same prices on Washington, D.C. Dulles Intl Airport-Cardiff flight deals on Cheapflights vs. Ovago >95% of the time. Price accuracy is based on data collected from Washington, D.C. Dulles Intl Airport-Cardiff flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Washington, D.C. Dulles Intl Airport-Cardiff flights, Cheapflights users trust Ovago the most. Ovago 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 Washington, D.C. Dulles Intl Airport-Cardiff flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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

For a flight from Washington, D.C. Dulles Intl to Cardiff, you will be flying into 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 inbound flights from Washington, D.C. Dulles Intl per day. 0 airlines have flights to Cardiff Wales from Washington, D.C. Dulles Intl on a regular basis.

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

Yes. In addition to deals on Dulles Intl to Cardiff flights, Cheapflights offers vacation packages that include both flights and hotel.

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

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

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

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

$453+ Cheap Flights from Washington, D.C. Dulles Intl Airport to Cardiff

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Cheap flight deals from Dulles Intl to Cardiff

Cheapest

Best

Last-minute

One-way

Cheapest flights from Dulles Intl to Cardiff
Explore the most affordable flight options available from Dulles Intl to Cardiff. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 31, 2026.

Mon 10/128:20 pm -

2 stops21h 30m

Mon 10/1910:10 pm -

2 stops27h 15m

Deal found 8/27

$832

Tue 10/134:00 pm -

2 stops26h 25m

Tue 10/209:45 pm -

2 stops26h 15m

Deal found 8/29

$887

Sun 10/115:15 pm -

1 stop23h 30m

Sun 10/189:35 am -

2 stops34h 55m

Deal found 8/26

$898

Thu 10/155:15 pm -

1 stop24h 05m

Mon 10/1910:10 pm -

2 stops25h 40m

Deal found 8/27

$1,048

Best flights from Dulles Intl to Cardiff
Discover carefully curated flight deals from Dulles Intl to Cardiff that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 31, 2026.

Mon 10/128:55 pm -

1 stop20h 55m

Mon 10/191:35 pm -

2 stops35h 00m

Deal found 8/27

$883

Thu 10/155:30 pm -

1 stop10h 45m

Mon 10/199:45 am -

1 stop10h 50m

Deal found 8/30

$1,231

Sun 10/115:15 pm -

1 stop23h 30m

Sun 10/189:35 am -

2 stops34h 55m

Deal found 8/26

$898

Tue 10/139:55 am -

3 stops32h 30m

Tue 10/209:45 pm -

2 stops26h 15m

Deal found 8/29

$1,024

Thu 10/155:15 pm -

1 stop24h 05m

Mon 10/1910:10 pm -

1 stop22h 35m

Deal found 8/27

$1,123

Wed 11/258:50 pm -

1 stop11h 10m

Sat 11/288:15 am -

2 stops15h 15m

Deal found 8/30

$1,150

Last-minute flights from Dulles Intl to Cardiff
Discover last-minute flight deals from Dulles Intl to Cardiff. Data last updated August 31, 2026 and is based on user searches.

Mon 8/316:10 pm -

1 stop10h 05m

Wed 9/99:45 am -

1 stop10h 50m

Deal found 8/30

$1,248

Mon 8/3112:29 pm -

2 stops15h 46m

Wed 9/99:45 am -

1 stop10h 50m

Deal found 8/28

$1,253

Sat 9/125:05 pm -

2 stops35h 55m

Fri 9/1810:45 pm -

1 stop25h 25m

Deal found 8/26

$1,192

Sat 9/125:30 pm -

1 stop18h 15m

Fri 9/185:15 pm -

1 stop27h 20m

Deal found 8/29

$1,341

Find flight deals from Dulles Intl to Cardiff

Most accurate provider	Ovago 3 stars
Most trusted provider	Ovago 3 stars
Round-trip from	$832 (Mytrip)
One-way from	$453 (Kiwi.com)

Provider with most accurate pricing for Washington, D.C. Dulles Intl-Cardiff Wales flight deals.

Search Deals

Provider most trusted by Cheapflights users for Washington, D.C. Dulles Intl-Cardiff Wales flights.

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

Search Deals

One-way flight from Washington, D.C. Dulles Intl to Cardiff Wales

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Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.Cardiff

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

IADCWL

Washington, D.C. Dulles Intl

Mon 10/12

8:55 pm-10:50 pm

1 stop20h 55m

Cardiff Wales

Mon 10/19

1:35 pm-7:35 pm

2 stops35h 00m

$883

Washington, D.C.Cardiff

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

IADCWL

Washington, D.C. Dulles Intl

Sun 10/11

5:15 pm-9:45 pm

1 stop23h 30m

Cardiff Wales

Sun 10/18

9:35 am-3:30 pm

2 stops34h 55m

$898

Washington, D.C.Cardiff

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

IADCWL

Washington, D.C. Dulles Intl

Tue 10/13

9:55 am-11:25 pm

3 stops32h 30m

Cardiff Wales

Tue 10/20

9:45 pm-7:00 pm

2 stops26h 15m

$1,024

Washington, D.C.Cardiff

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

IADCWL

Washington, D.C. Dulles Intl

Thu 10/15

5:15 pm-10:20 pm

1 stop24h 05m

Cardiff Wales

Mon 10/19

10:10 pm-3:45 pm

1 stop22h 35m

$1,123

Washington, D.C.Cardiff

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

IADCWL

Washington, D.C. Dulles Intl

Wed 11/25

8:50 pm-1:00 pm

1 stop11h 10m

Cardiff Wales

Sat 11/28

8:15 am-6:30 pm

2 stops15h 15m

$1,150

Quickest round-trip

Washington, D.C.Cardiff

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

IADCWL

Washington, D.C. Dulles Intl

Thu 10/15

5:30 pm-9:15 am

1 stop10h 45m

Cardiff Wales

Mon 10/19

9:45 am-3:35 pm

1 stop10h 50m

$1,231

Cheapest one-way

Quickest one-way

Washington, D.C.Cardiff

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

IADCWL

Washington, D.C. Dulles Intl

Sun 9/6

5:35 pm-9:50 am

3 stops35h 15m

$494

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/29

Sorted by cheapest first

Compare providers for flights from Dulles Intl to Cardiff

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Dulles Intl to Cardiff in August.

Provider	Price Accuracy	Trust Score*
Ovago	Price Accuracy3 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-Cardiff flights, users find the pricing of Ovago to be most consistent on Cheapflights vs. Ovago Users can find the same prices on Washington, D.C. Dulles Intl Airport-Cardiff flight deals on Cheapflights vs. Ovago >95% of the time. Price accuracy is based on data collected from Washington, D.C. Dulles Intl Airport-Cardiff flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-Cardiff flights, Cheapflights users trust Ovago the most. Ovago 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 Washington, D.C. Dulles Intl Airport-Cardiff 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 Dulles Intl to Cardiff

Have a flexible travel schedule? Discover the best time to fly to Cardiff from Dulles Intl with our price prediction graph.

IAD-CWL

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.

Related info for your journey

What airport do you fly into for flights to Cardiff from Washington, D.C. Dulles Intl?
For a flight from Washington, D.C. Dulles Intl to Cardiff, you will be flying into 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 inbound flights from Washington, D.C. Dulles Intl per day. 0 airlines have flights to Cardiff Wales from Washington, D.C. Dulles Intl on a regular basis.
Can I find deals for flights from Dulles Intl to Cardiff that include hotel bookings?
Yes. In addition to deals on Dulles Intl to Cardiff flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Dulles Intl to Cardiff?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Dulles Intl to Cardiff.
Can I find deals for business class flights from Dulles Intl to Cardiff?
Yes. Cheapflights offers flight deals from Dulles Intl to Cardiff by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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$453+ Cheap flights from Dulles Intl (IAD) to Cardiff (CWL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/6. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Dulles Intl to Cardiff with Cheapflights

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Cheap flight deals from Dulles Intl to Cardiff

Cheapest flights from Dulles Intl to CardiffExplore the most affordable flight options available from Dulles Intl to Cardiff. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 31, 2026.

Explore the most affordable flight options available from Dulles Intl to Cardiff. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 31, 2026.

Best flights from Dulles Intl to CardiffDiscover carefully curated flight deals from Dulles Intl to Cardiff that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 31, 2026.

Discover carefully curated flight deals from Dulles Intl to Cardiff that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 31, 2026.

Last-minute flights from Dulles Intl to CardiffDiscover last-minute flight deals from Dulles Intl to Cardiff. Data last updated August 31, 2026 and is based on user searches.

Discover last-minute flight deals from Dulles Intl to Cardiff. Data last updated August 31, 2026 and is based on user searches.

One-way flights from Dulles Intl to CardiffSearch for one-way flight options from Dulles Intl to Cardiff. Find affordable one-way fares based on user searches. Data last updated August 31, 2026.

Search for one-way flight options from Dulles Intl to Cardiff. Find affordable one-way fares based on user searches. Data last updated August 31, 2026.

Find flight deals from Dulles Intl to Cardiff

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Round-trip from

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Cheapflights Fare Finder

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

Compare providers for flights from Dulles Intl to Cardiff

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Dulles Intl to Cardiff in August.

Best time to book a flight from Dulles Intl to Cardiff

Have a flexible travel schedule? Discover the best time to fly to Cardiff from Dulles Intl with our price prediction graph.

Related info for your journey

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

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

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

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

Traveling to a place near Cardiff?

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Alternative routes for Dulles Intl to Cardiff

See prices for flight routes from nearby airports that may be better suited for you.

Other flights to Cardiff

Explore flights to Cardiff departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on August 31, 2026.

Complete your trip

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Search flights from Dulles Intl to Cardiff by cabin class

Find flights from Dulles Intl to Cardiff, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Dulles Intl and Cardiff flights

Browse other Dulles Intl and Cardiff flight options. Last updated on August 31, 2026.

Other flights from Dulles Intl

Browse through other flights departing from Dulles Intl. Flights are based on user searches made on Cheapflights and were last updated on August 31, 2026.

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Cheapest flights from Dulles Intl to Cardiff
Explore the most affordable flight options available from Dulles Intl to Cardiff. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 31, 2026.

Best flights from Dulles Intl to Cardiff
Discover carefully curated flight deals from Dulles Intl to Cardiff that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 31, 2026.

Last-minute flights from Dulles Intl to Cardiff
Discover last-minute flight deals from Dulles Intl to Cardiff. Data last updated August 31, 2026 and is based on user searches.

One-way flights from Dulles Intl to Cardiff
Search for one-way flight options from Dulles Intl to Cardiff. Find affordable one-way fares based on user searches. Data last updated August 31, 2026.