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Cheap flights from Cardiff to Washington, D.C. from $738

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Cardiff to Washington, D.C. departing on 9/13. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Cardiff to Washington, D.C. (CWL-IAD)

Cheap round-trip flights

Logo
9:00 am - 3:50 pmCWL-IAD
11h 50m1 stop
Logo
8:25 pm - 10:35 amIAD-CWL
9h 10m1 stop
$738
Find Deal
Sat, Sep 13 - Sat, Sep 20
KLM Logo
9:50 am - 3:35 pmCWL-IAD
10h 45m1 stop
KLM Logo
5:25 pm - 4:45 pmIAD-CWL
18h 20m1 stop
$790KLM
Find Deal
Wed, Oct 1 - Wed, Oct 8
Virgin Atlantic Logo
9:50 am - 11:17 pmCWL-IAD
18h 27m2 stops
Virgin Atlantic Logo
7:05 am - 9:15 amIAD-CWL
21h 10m2 stops
$795Virgin Atlantic
Find Deal
Wed, Oct 1 - Wed, Oct 8
Air France Logo
9:50 am - 7:15 pmCWL-IAD
14h 25m2 stops
Air France Logo
5:25 pm - 4:45 pmIAD-CWL
18h 20m1 stop
$830Air France
Find Deal
Mon, Sep 8 - Mon, Sep 15
Logo
5:15 pm - 3:35 pmCWL-IAD
27h 20m1 stop
Logo
5:25 pm - 4:45 pmIAD-CWL
18h 20m1 stop
$851
Find Deal
Mon, Sep 8 - Mon, Sep 15
Logo
9:00 am - 3:50 pmCWL-IAD
11h 50m1 stop
Logo
10:35 pm - 12:45 pmIAD-CWL
33h 10m2 stops
$853
Find Deal
Sat, Sep 13 - Sat, Sep 20
Logo
8:20 pm - 3:20 pmCWL-IAD
24h 00m2 stops
Logo
11:30 pm - 11:20 pmIAD-CWL
19h 50m2 stops
$918
Find Deal
Thu, Oct 23 - Fri, Oct 31
KLM Logo
9:45 am - 7:37 pmCWL-IAD
14h 52m2 stops
KLM Logo
9:20 pm - 4:45 pmIAD-CWL
14h 25m2 stops
$1,023KLM
Find Deal
Sat, Sep 13 - Sat, Sep 20
British Airways Logo
12:00 pm - 5:35 pmCWL-IAD
34h 35m2 stops
British Airways Logo
5:50 pm - 11:30 amIAD-CWL
12h 40m2 stops
$1,025British Airways
Find Deal
Mon, Sep 8 - Mon, Sep 15
Virgin Atlantic Logo
5:15 pm - 3:35 pmCWL-IAD
27h 20m1 stop
Virgin Atlantic Logo
7:05 pm - 9:50 amIAD-CWL
10h 45m1 stop
$1,033Virgin Atlantic
Find Deal
Thu, Oct 23 - Fri, Oct 31

KLM flights from Cardiff to Washington, D.C. Dulles Intl Airport

Our best KLM deals on Cardiff to Washington, D.C. Dulles Intl Airport flight tickets
KLM
Oct 1
CWL9:50 amCardiff Wales
10h 45m
1 stop
IAD3:35 pmWashington, D.C. Dulles Intl
Oct 8
IAD5:25 pmWashington, D.C. Dulles Intl
18h 20m
1 stop
CWL4:45 pmCardiff Wales
$790
Find similar
KLM
Sep 13
CWL9:45 amCardiff Wales
14h 52m
2 stops
IAD7:37 pmWashington, D.C. Dulles Intl
Sep 20
IAD9:20 pmWashington, D.C. Dulles Intl
14h 25m
2 stops
CWL4:45 pmCardiff Wales
$1,023
Find similar

Virgin Atlantic flights from Cardiff to Washington, D.C. Dulles Intl Airport

Our best Virgin Atlantic deals on Cardiff to Washington, D.C. Dulles Intl Airport flight tickets
Virgin Atlantic
Oct 1
CWL9:50 amCardiff Wales
18h 27m
2 stops
IAD11:17 pmWashington, D.C. Dulles Intl
Oct 8
IAD7:05 amWashington, D.C. Dulles Intl
21h 10m
2 stops
CWL9:15 amCardiff Wales
$795
Find similar
Virgin Atlantic
Oct 23
CWL5:15 pmCardiff Wales
27h 20m
1 stop
IAD3:35 pmWashington, D.C. Dulles Intl
Oct 31
IAD7:05 pmWashington, D.C. Dulles Intl
10h 45m
1 stop
CWL9:50 amCardiff Wales
$1,033
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Cardiff to Washington, D.C. Dulles Intl Airport that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated August 18, 2025.
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 9/13

9:00 am-3:50 pm

1 stop11h 50m

Washington, D.C. Dulles Intl

Sat 9/20

8:25 pm-10:35 am

1 stop9h 10m

$738

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Wed 10/1

9:50 am-3:35 pm

1 stop10h 45m

Washington, D.C. Dulles Intl

Wed 10/8

5:25 pm-4:45 pm

1 stop18h 20m

$790

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Wed 10/1

9:50 am-11:17 pm

2 stops18h 27m

Washington, D.C. Dulles Intl

Wed 10/8

7:05 am-9:15 am

2 stops21h 10m

$795

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Mon 9/8

9:50 am-7:15 pm

2 stops14h 25m

Washington, D.C. Dulles Intl

Mon 9/15

5:25 pm-4:45 pm

1 stop18h 20m

$830

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Mon 9/8

5:15 pm-3:35 pm

1 stop27h 20m

Washington, D.C. Dulles Intl

Mon 9/15

5:25 pm-4:45 pm

1 stop18h 20m

$851

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Sat 9/13

9:00 am-3:50 pm

1 stop11h 50m

Washington, D.C. Dulles Intl

Sat 9/20

10:35 pm-12:45 pm

2 stops33h 10m

$853

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Thu 10/23

8:20 pm-3:20 pm

2 stops24h 00m

Washington, D.C. Dulles Intl

Fri 10/31

11:30 pm-11:20 pm

2 stops19h 50m

$918

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Sat 9/13

9:45 am-7:37 pm

2 stops14h 52m

Washington, D.C. Dulles Intl

Sat 9/20

9:20 pm-4:45 pm

2 stops14h 25m

$1,023

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Mon 9/8

12:00 pm-5:35 pm

2 stops34h 35m

Washington, D.C. Dulles Intl

Mon 9/15

5:50 pm-11:30 am

2 stops12h 40m

$1,025

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Thu 10/23

5:15 pm-3:35 pm

1 stop27h 20m

Washington, D.C. Dulles Intl

Fri 10/31

7:05 pm-9:50 am

1 stop10h 45m

$1,033

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

When to book flights from Cardiff to Washington, D.C. Dulles Intl Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Cardiff to Washington, D.C. Dulles Intl Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Cardiff to Washington, D.C. Dulles Intl Airport (CWL to IAD) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Cardiff to Washington, D.C. Dulles Intl Airport

Best Price Found

$738

Fastest flight time

10h 45m

Direct flights

None
The best flight deal from Cardiff to Washington, D.C. Dulles Intl Airport found on momondo in the last 72 hours is $738
The fastest flight from Cardiff to Washington, D.C. Dulles Intl Airport takes 10h 45m
There are no direct flights from Cardiff to Washington, D.C. Dulles Intl Airport. Popular non-direct route for this connection is Cardiff Wales Airport - Washington, D.C. Dulles Intl Airport.
Search flight deals

  • How far is Cardiff Wales to Washington, D.C. Dulles Intl by plane?

    Cardiff Wales and Washington, D.C. Dulles Intl are 3552.6 mi apart from one another. Typically, this will take 10h 45m by plane in normal conditions.

  • When did momondo last update prices for flights from Cardiff Wales Airport to Washington, D.C. Dulles Intl Airport?

    Prices for flights from Cardiff Wales Airport to Washington, D.C. Dulles Intl Airport refresh daily.

  • How old do you have to be to fly from Cardiff Wales Airport to Washington, D.C. Dulles Intl Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Cardiff Wales Airport to Washington, D.C. Dulles Intl Airport.

  • What documentation or ID do you need to fly to Washington, D.C. Dulles Intl Airport?

    The necessary travel and health documents for your Washington, D.C. Dulles Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • How do I get Price Alerts for flights from Cardiff to Washington, D.C. Dulles Intl Airport?

    Confirm your travel details to search for the latest offers for flights from Cardiff to Washington, D.C. Dulles Intl Airport. While browsing offers there will be the option to toggle “Price Alerts”. You’ll then receive updates when prices for the flight route increase or decrease.

  • How can I save money on flights from Cardiff to Washington, D.C. Dulles Intl Airport with momondo?

    Leverage our AI within our “Price Forecast” tool, which predicts if it’s better to book now or wait until prices decrease. You can strategically pick the best days to fly and save money on your trip by using our “Price Calendar” tool. “Explore” shows an overview of how much it costs to fly to anywhere from a selected city or airport. Our “Discover” content is a great option for travel inspiration and money-saving tips, while “Price Alerts” will update you when prices change, so you can book when fares are right.

  • How does momondo find its flight prices?

    We compare prices from 700+ competitors to help you find the price that works best for you. momondo operates in over 30 international markets, bringing you access to a wide range of fares and deals. Search for your travel using momondo for a diverse range of options from airlines and OTAs.

Traveling to a place near Washington, D.C.?

Book flights to Washington, D.C. if you plan to visit one of these locations
Alexandria
Gettysburg
Arlington
National Harbor
Winchester
Woodbridge
Tysons
Laurel
Silver Spring
Waldorf
Fredericksburg
Colonial Beach
Manassas
Harpers Ferry
Rockville
Towson
Gaithersburg
Fairfax
Reston
Glen Burnie

Why use momondo?

Why should I use momondo to find a flight deal from Cardiff to Washington, D.C.?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Washington, D.C. from Cardiff.

Can I find flights from Cardiff to Washington, D.C. with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Washington, D.C. from Cardiff with this policy.

How can momondo help me find flights from Cardiff to Washington, D.C.?

Once all potential Cardiff to Washington, D.C. flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Cardiff to Washington, D.C. right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Washington, D.C. from Cardiff. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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