$495 Cheap Flights from Washington (IAD) to Cardiff (CWL)

View $495 flight on Thu, Mar 5, 2026Opens in a new window

Popular airlines from Washington Dulles Intl. Airport (IAD) to Cardiff International Airport (CWL)

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Cheap Flights from Washington to Cardiff (IAD-CWL)

Prices were available within the past 7 days and start at $495 for one-way flights and $817 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Virgin Atlantic
Fri, Nov 14 - Thu, Nov 27
IAD
Washington
CWL
Cardiff
$817 Roundtrip, found 2 days ago
$817
Roundtrip
found 2 days ago
Select Virgin Atlantic flight, departing Fri, Nov 14 from Washington to Cardiff, returning Thu, Nov 27, priced at $817 found 2 days ago
Delta
Tue, Nov 18 - Thu, Nov 27
IAD
Washington
CWL
Cardiff
$822 Roundtrip, found 14 hours ago
$822
Roundtrip
found 14 hours ago
Select Delta flight, departing Tue, Nov 18 from Washington to Cardiff, returning Thu, Nov 27, priced at $822 found 14 hours ago
Delta
Fri, Oct 10 - Sat, Oct 25
IAD
Washington
CWL
Cardiff
$825 Roundtrip, found 4 days ago
$825
Roundtrip
found 4 days ago
Select Delta flight, departing Fri, Oct 10 from Washington to Cardiff, returning Sat, Oct 25, priced at $825 found 4 days ago
Delta
Wed, Nov 12 - Wed, Nov 19
IAD
Washington
CWL
Cardiff
$830 Roundtrip, found 1 day ago
$830
Roundtrip
found 1 day ago
Select Delta flight, departing Wed, Nov 12 from Washington to Cardiff, returning Wed, Nov 19, priced at $830 found 1 day ago
Virgin Atlantic
Mon, Feb 2 - Mon, Feb 9
IAD
Washington
CWL
Cardiff
$834 Roundtrip, found 19 hours ago
$834
Roundtrip
found 19 hours ago
Select Virgin Atlantic flight, departing Mon, Feb 2 from Washington to Cardiff, returning Mon, Feb 9, priced at $834 found 19 hours ago
Delta
Sat, Sep 20 - Sat, Oct 4
IAD
Washington
CWL
Cardiff
$835 Roundtrip, found 4 days ago
$835
Roundtrip
found 4 days ago
Select Delta flight, departing Sat, Sep 20 from Washington to Cardiff, returning Sat, Oct 4, priced at $835 found 4 days ago
Delta
Sat, Mar 7 - Mon, Mar 16
IAD
Washington
CWL
Cardiff
$838 Roundtrip, found 19 hours ago
$838
Roundtrip
found 19 hours ago
Select Delta flight, departing Sat, Mar 7 from Washington to Cardiff, returning Mon, Mar 16, priced at $838 found 19 hours ago
KLM
Thu, Oct 16 - Sat, Oct 25
IAD
Washington
CWL
Cardiff
$851 Roundtrip, found 4 days ago
$851
Roundtrip
found 4 days ago
Select KLM flight, departing Thu, Oct 16 from Washington to Cardiff, returning Sat, Oct 25, priced at $851 found 4 days ago
Air France
Thu, Apr 9 - Thu, Apr 16
IAD
Washington
CWL
Cardiff
$902 Roundtrip, found 5 days ago
$902
Roundtrip
found 5 days ago
Select Air France flight, departing Thu, Apr 9 from Washington to Cardiff, returning Thu, Apr 16, priced at $902 found 5 days ago
ITA Airways
Thu, Sep 25 - Wed, Oct 1
IAD
Washington
CWL
Cardiff
$2,070 Roundtrip, found 20 hours ago
$2,070
Roundtrip
found 20 hours ago
Select ITA Airways flight, departing Thu, Sep 25 from Washington to Cardiff, returning Wed, Oct 1, priced at $2,070 found 20 hours ago

Frequently asked questions

How much does a flight from Washington Dulles Intl. Airport (IAD) to Cardiff Intl. Airport (CWL) cost?
Get a cheap one-way flight from $495 or cheap return flight from $817 from Washington Dulles Intl. Airport (IAD) to Cardiff Intl. Airport (CWL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Washington Dulles Intl. Airport (IAD) to Cardiff Intl. Airport (CWL)?
Planning your getaway for November is a good way to save, as it's the cheapest month for flights between IAD and CWL. You'll typically find the lowest prices during off-peak months.
What is the cheapest airline that flies from Washington Dulles Intl. Airport (IAD) to Cardiff Intl. Airport (CWL)?
Expedia's filter tool lets you easily compare different airlines, departure times and fares all in one place. Choose your preferences, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest IAD to CWL flight.
How many flights per day from Washington Dulles Intl. Airport (IAD) to Cardiff Intl. Airport (CWL)?
You'll need to take a flight with a layover if you're traveling from Washington Dulles Intl. Airport (IAD) to Cardiff Intl. Airport (CWL). There are no daily direct flights on this route. However, simply filter your search to include one or two stops to discover the best option for your trip.
What day of the week has the most flights from IAD to CWL?
You'll typically find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can vary from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Washington Dulles Intl. Airport (IAD) to Cardiff Intl. Airport (CWL)?
To avoid potential delays on the Washington Dulles Intl. Airport (IAD) to Cardiff Intl. Airport (CWL) route, aim to travel before 3 PM. Departures after this time are 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Washington Dulles Intl. Airport (IAD) to Cardiff Intl. Airport (CWL) last-minute?
Holding off until just before your departure to book a flight from IAD to CWL often results in higher prices. Although you may find some last-minute offers, there's no guarantee. Be flexible with your travel plans to boost your chances of getting a bargain.
Is it cheaper to book an IAD to CWL flight and hotel package?
Compared with arranging hotels and flights separately, booking an IAD to CWL flight and hotel package with Expedia could lead to significant savings. Better still, having everything in one convenient place takes the hassle out of planning your trip. Just secure your flights and select from our extensive range of stays, then customize your trip with extras like tours, activities and car rentals.
Can I cancel or change the date of my flight from Washington Dulles Intl. Airport (IAD) to Cardiff Intl. Airport (CWL)?
If you reserved your IAD to CWL flight within the last 24 hours, you may be able to modify or cancel it at no cost. Depending on the airline and the type of fare you purchased, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal for further details.

Travel information

Travel information

Origin airport
Washington Dulles Intl.
Destination airport
Cardiff Intl.
Airlines serving
Air France, Delta, ITA Airways, KLM, Virgin Atlantic
Roundtrip price
$817
Distance
3549 mi

Book with confidence

Book with confidence

Washington to Cardiff Flights

The cheapest times to fly from Washington to Cardiff

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Washington to Cardiff are during the month of November. You can find some of the cheapest flights from Washington to Cardiff with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Washington to Cardiff

Sunday is one of the best days to book for cheap flights from Washington to Cardiff: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Washington to Cardiff

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Washington to Cardiff in 2025. You can also book with separate airlines for your outbound and return journeys, from $495 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Washington to Cardiff flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Washington to Cardiff airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Washington to Cardiff Flights

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