$780 Cheap Flights from Cardiff (CWL) to Washington (IAD)

View $780 flight on Tue, Nov 4, 2025Opens in a new window

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

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Cheap Flights from Cardiff to Washington (CWL-IAD)

Prices were available within the past 7 days and start at $780 for one-way flights and $736 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Virgin Atlantic
Sun, Sep 21 - Sat, Oct 4
CWL
Cardiff
IAD
Washington
$736 Roundtrip, found 4 days ago
$736
Roundtrip
found 4 days ago
Select Virgin Atlantic flight, departing Sun, Sep 21 from Cardiff to Washington, returning Sat, Oct 4, priced at $736 found 4 days ago
Delta
Tue, Jun 30 - Tue, Jul 14
CWL
Cardiff
IAD
Washington
$1,017 Roundtrip, found 10 hours ago
$1,017
Roundtrip
found 10 hours ago
Select Delta flight, departing Tue, Jun 30 from Cardiff to Washington, returning Tue, Jul 14, priced at $1,017 found 10 hours ago
Air France
Tue, Jun 30 - Tue, Jul 14
CWL
Cardiff
IAD
Washington
$1,044 Roundtrip, found 10 hours ago
$1,044
Roundtrip
found 10 hours ago
Select Air France flight, departing Tue, Jun 30 from Cardiff to Washington, returning Tue, Jul 14, priced at $1,044 found 10 hours ago
Delta
Tue, Jun 30 - Tue, Jul 14
CWL
Cardiff
IAD
Washington
$1,060 Roundtrip, found 10 hours ago
$1,060
Roundtrip
found 10 hours ago
Select Delta flight, departing Tue, Jun 30 from Cardiff to Washington, returning Tue, Jul 14, priced at $1,060 found 10 hours ago
KLM
Tue, Jun 30 - Tue, Jul 14
CWL
Cardiff
IAD
Washington
$1,072 Roundtrip, found 10 hours ago
$1,072
Roundtrip
found 10 hours ago
Select KLM flight, departing Tue, Jun 30 from Cardiff to Washington, returning Tue, Jul 14, priced at $1,072 found 10 hours ago
Air France
Tue, Jun 30 - Tue, Jul 14
CWL
Cardiff
IAD
Washington
$1,072 Roundtrip, found 10 hours ago
$1,072
Roundtrip
found 10 hours ago
Select Air France flight, departing Tue, Jun 30 from Cardiff to Washington, returning Tue, Jul 14, priced at $1,072 found 10 hours ago
Loganair
Sun, Sep 21 - Sat, Oct 4
CWL
Cardiff
IAD
Washington
$1,083 Roundtrip, found 4 days ago
$1,083
Roundtrip
found 4 days ago
Select Loganair flight, departing Sun, Sep 21 from Cardiff to Washington, returning Sat, Oct 4, priced at $1,083 found 4 days ago
Delta
Tue, Jun 30 - Tue, Jul 14
CWL
Cardiff
IAD
Washington
$1,087 Roundtrip, found 10 hours ago
$1,087
Roundtrip
found 10 hours ago
Select Delta flight, departing Tue, Jun 30 from Cardiff to Washington, returning Tue, Jul 14, priced at $1,087 found 10 hours ago
Loganair
Sun, Sep 21 - Sat, Oct 4
CWL
Cardiff
IAD
Washington
$1,093 Roundtrip, found 4 days ago
$1,093
Roundtrip
found 4 days ago
Select Loganair flight, departing Sun, Sep 21 from Cardiff to Washington, returning Sat, Oct 4, priced at $1,093 found 4 days ago
Air France
Tue, Jun 30 - Tue, Jul 14
CWL
Cardiff
IAD
Washington
$1,099 Roundtrip, found 10 hours ago
$1,099
Roundtrip
found 10 hours ago
Select Air France flight, departing Tue, Jun 30 from Cardiff to Washington, returning Tue, Jul 14, priced at $1,099 found 10 hours ago

Frequently asked questions

How much does a flight from Cardiff Intl. Airport (CWL) to Washington Dulles Intl. Airport (IAD) cost?
Snag a cheap one-way flight from $780 or cheap return flight from $736 from Cardiff Intl. Airport (CWL) to Washington Dulles Intl. Airport (IAD) 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 Cardiff Intl. Airport (CWL) to Washington Dulles Intl. Airport (IAD)?
September is the cheapest month to fly from CWL to IAD. Avoiding peak travel times is often the key to finding a great deal.
What is the cheapest airline that flies from Cardiff Intl. Airport (CWL) to Washington Dulles Intl. Airport (IAD)?
Use the filter tool on Expedia to compare airlines and find the most affordable carrier that'll fly you from CWL to IAD. Then, sort your results by "Price (lowest to highest)" to snag a great deal.
How many flights per day from Cardiff Intl. Airport (CWL) to Washington Dulles Intl. Airport (IAD)?
Direct flights from Cardiff Intl. Airport (CWL) to Washington Dulles Intl. Airport (IAD) aren't available daily, so you'll have to take a flight with a layover. Explore your options with our filter tool. Enter your travel dates and pick either "1 Stop" or "2+ Stops."
What day of the week has the most flights from CWL to IAD?
Typically you'll have the most choice when it comes to flights on a Friday. Tuesdays tend to be the quietest.* But this can vary depending on the time of year, carrier and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Cardiff Intl. Airport (CWL) to Washington Dulles Intl. Airport (IAD)?
To reach Washington Dulles Intl. Airport (IAD) on time, book a flight that takes off from Cardiff Intl. Airport (CWL) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this time.**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 Cardiff Intl. Airport (CWL) to Washington Dulles Intl. Airport (IAD) last-minute?
Waiting until right before your break to book a flight from CWL to IAD generally means paying more. While it's possible to find some last-minute offers, there's no guarantee. Keep your travel schedule open to maximize your chances of snagging a bargain.
Is it cheaper to book a CWL to IAD flight and hotel package?
Compared with arranging hotels and flights separately, booking a CWL to IAD flight and hotel package with Expedia could lead to significant savings. Better still, having it all in one place will take the stress out of travel planning. Just pick your flights and choose from our extensive range of hotels, then personalize your trip with extras like tours, activities and car rentals.
Can I cancel or change the date of my flight from Cardiff Intl. Airport (CWL) to Washington Dulles Intl. Airport (IAD)?
If you booked your CWL to IAD flight within the last 24 hours, you may be able to cancel or modify it without any fees. Depending on the airline and the type of fare you purchased, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal for more information.

Travel information

Travel information

Origin airport
Cardiff Intl.
Destination airport
Washington Dulles Intl.
Airlines serving
Air France, British Airways, Delta, KLM, Virgin Atlantic
Roundtrip price
$735
Distance
3549 mi

Book with confidence

Book with confidence

Cardiff to Washington Flights

The cheapest times to fly from Cardiff to Washington

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 Cardiff to Washington are during the month of September. You can find some of the cheapest flights from Cardiff to Washington with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Cardiff to Washington

Sunday is one of the best days to book for cheap flights from Cardiff to Washington: 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 Cardiff to Washington

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 Cardiff to Washington in 2025. You can also book with separate airlines for your outbound and return journeys, from $780 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 Cardiff to Washington 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 Cardiff to Washington 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.

 

Cardiff to Washington Flights

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*Available to One Key members.