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.

$424+ 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	$708 (Kiwi.com)
One-way from	$424 (Kiwi.com)

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

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

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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 August 14, 2025.

Sat 9/279:00 amCWL - IAD

1 stop11h 50mMultiple Airlines

Sat 10/45:20 pmIAD - CWL

1 stop12h 15mMultiple Airlines

Deal found 8/13

$708

Sat 9/279:45 amCWL - IAD

1 stop10h 50mVirgin Atlantic

Sat 10/412:08 pmIAD - CWL

2 stops16h 07mVirgin Atlantic

Deal found 8/13

$867

Sat 9/279:45 amCWL - IAD

2 stops14h 52mDelta

Sat 10/45:25 pmIAD - CWL

2 stops18h 20mDelta

Deal found 8/13

$872

Mon 8/181:10 pmCWL - IAD

2 stops38h 00mMultiple Airlines

Mon 8/255:20 pmIAD - CWL

1 stop17h 35mMultiple Airlines

Deal found 8/13

$1,422

Mon 8/1812:00 pmCWL - IAD

2 stops34h 35mBritish Airways

Mon 8/255:55 pmIAD - CWL

2 stops12h 35mBritish Airways

Deal found 8/13

$1,796

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 August 14, 2025.

Sat 9/279:00 amCWL - IAD

1 stop11h 50mMultiple Airlines

Sat 10/45:20 pmIAD - CWL

1 stop12h 15mMultiple Airlines

Deal found 8/13

$708

Sat 9/279:45 amCWL - IAD

1 stop10h 50mVirgin Atlantic

Sat 10/412:08 pmIAD - CWL

2 stops16h 07mVirgin Atlantic

Deal found 8/13

$867

Sat 9/279:45 amCWL - IAD

2 stops14h 52mDelta

Sat 10/45:25 pmIAD - CWL

2 stops18h 20mDelta

Deal found 8/13

$872

Last-minute flights from Cardiff to Dulles Intl
Discover last-minute flight deals from Cardiff to Dulles Intl. Data last updated August 14, 2025 and is based on user searches.

Mon 8/181:10 pmCWL - IAD

2 stops38h 00mMultiple Airlines

Mon 8/255:20 pmIAD - CWL

1 stop17h 35mMultiple Airlines

Deal found 8/13

$1,422

Mon 8/1812:00 pmCWL - IAD

2 stops34h 35mBritish Airways

Mon 8/255:55 pmIAD - CWL

2 stops12h 35mBritish Airways

Deal found 8/13

$1,796

Sat 9/279:00 amCWL - IAD

1 stop11h 50mMultiple Airlines

Sat 10/45:20 pmIAD - CWL

1 stop12h 15mMultiple Airlines

Deal found 8/13

$708

Sat 9/279:45 amCWL - IAD

1 stop10h 50mVirgin Atlantic

Sat 10/412:08 pmIAD - CWL

2 stops16h 07mVirgin Atlantic

Deal found 8/13

$867

Sat 9/279:45 amCWL - IAD

2 stops14h 52mDelta

Sat 10/45:25 pmIAD - CWL

2 stops18h 20mDelta

Deal found 8/13

$872

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 August 14, 2025.

Sat 10/49:00 amCWL - IAD

3 stops35h 20mMultiple Airlines

Deal found 8/14

$424

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

Sat 9/27

9:00 am-3:50 pm

1 stop11h 50m

Washington, D.C. Dulles Intl

Sat 10/4

5:20 pm-10:35 am

1 stop12h 15m

$708

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Sat 9/27

9:45 am-3:35 pm

1 stop10h 50m

Washington, D.C. Dulles Intl

Sat 10/4

12:08 pm-9:15 am

2 stops16h 07m

$867

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Sat 9/27

9:45 am-7:37 pm

2 stops14h 52m

Washington, D.C. Dulles Intl

Sat 10/4

5:25 pm-4:45 pm

2 stops18h 20m

$872

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Sat 10/4

9:00 am-3:20 pm

3 stops35h 20m

$424

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/14

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, July is the cheapest month in which you can book a flight from Cardiff to Washington, D.C. Dulles Intl Airport (average of $302). Flying from Cardiff to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $337). 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.

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.
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, July is the cheapest month in which you can book a flight from Cardiff to Washington, D.C. Dulles Intl Airport (average of $302). Flying from Cardiff to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $337). 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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$424+ Cheap flights from Cardiff (CWL) to Dulles Intl (IAD)

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 10/4. 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

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2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Cardiff to Dulles Intl

Round-trip from

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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 August 14, 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 August 14, 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?

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?

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 Washington, D.C. Dulles Intl Airport?

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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 August 14, 2025.