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Cheap flights from Cardiff to Washington, D.C. from $463

This is the cheapest one-way 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 5/23. 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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0 bags

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Find the cheapest flights from Cardiff to Washington, D.C.

Cheap round-trip flights

Enter your travel dates to find the best prices.
KLM Logo
5:25 pm - 4:05 pm
CWL
-
IAD
27h 40m1 stop
KLM Logo
7:30 pm - 4:55 pm
IAD
-
CWL
16h 25m2 stops
$735KLM
mié., feb. 4 - mié., feb. 11
KLM Logo
5:30 pm - 4:05 pm
CWL
-
IAD
27h 35m1 stop
KLM Logo
12:23 pm - 9:50 am
IAD
-
CWL
16h 27m2 stops
$737KLM
dom., ene. 18 - dom., ene. 25
KLM Logo
10:20 am - 11:06 pm
CWL
-
IAD
17h 46m2 stops
KLM Logo
7:30 pm - 4:55 pm
IAD
-
CWL
16h 25m2 stops
$741KLM
mié., feb. 4 - mié., feb. 11
KLM Logo
10:20 am - 10:57 pm
CWL
-
DCA
17h 37m2 stops
KLM Logo
7:30 pm - 4:55 pm
DCA
-
CWL
16h 25m2 stops
$741KLM
mié., feb. 4 - mié., feb. 11
KLM Logo
10:15 am - 7:09 pm
CWL
-
IAD
13h 54m2 stops
KLM Logo
12:40 pm - 9:50 am
IAD
-
CWL
16h 10m2 stops
$755KLM
dom., ene. 18 - dom., ene. 25
KLM Logo
10:20 am - 9:24 am
CWL
-
BWI
28h 04m2 stops
KLM Logo
6:59 pm - 4:55 pm
BWI
-
CWL
16h 56m2 stops
$780KLM
mié., feb. 4 - mié., feb. 11
Multiple Airlines Logo
3:55 pm - 3:15 pm
CWL
-
IAD
28h 20m2 stops
Multiple Airlines Logo
7:40 pm - 8:05 am
IAD
-
CWL
31h 25m3 stops
$1,048Multiple Airlines
mié., feb. 4 - mié., feb. 11
Multiple Airlines Logo
9:20 pm - 3:15 pm
CWL
-
IAD
22h 55m2 stops
Multiple Airlines Logo
7:40 pm - 9:50 am
IAD
-
CWL
33h 10m3 stops
$1,060Multiple Airlines
dom., ene. 18 - dom., ene. 25
Multiple Airlines Logo
10:15 am - 2:40 pm
CWL
-
IAD
33h 25m3 stops
Multiple Airlines Logo
6:00 pm - 9:50 am
IAD
-
CWL
34h 50m3 stops
$1,106Multiple Airlines
dom., ene. 18 - dom., ene. 25
Multiple Airlines Logo
3:55 pm - 3:35 pm
CWL
-
IAD
28h 40m1 stop
Multiple Airlines Logo
5:05 pm - 10:05 am
IAD
-
CWL
12h 00m1 stop
$1,134Multiple Airlines
mié., feb. 4 - mié., feb. 11

KLM flights from Cardiff to Washington, D.C.

Our best KLM deals on Cardiff to Washington, D.C. flight tickets
KLM
Feb 4
CWL5:25 pmCardiff Wales
27h 40m
1 stop
IAD4:05 pmWashington, D.C. Dulles Intl
Feb 11
IAD7:30 pmWashington, D.C. Dulles Intl
16h 25m
2 stops
CWL4:55 pmCardiff Wales
$735
Find similar
KLM
Jan 18
CWL5:30 pmCardiff Wales
27h 35m
1 stop
IAD4:05 pmWashington, D.C. Dulles Intl
Jan 25
IAD12:23 pmWashington, D.C. Dulles Intl
16h 27m
2 stops
CWL9:50 amCardiff Wales
$737
Find similar
KLM
Feb 4
CWL10:20 amCardiff Wales
17h 46m
2 stops
IAD11:06 pmWashington, D.C. Dulles Intl
Feb 11
IAD7:30 pmWashington, D.C. Dulles Intl
16h 25m
2 stops
CWL4:55 pmCardiff Wales
$741
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Cardiff to Washington, D.C. 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 diciembre 23, 2025.
Use the filters below to find and compare flights from Cardiff to Washington, D.C. that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

mié. 2/4

5:25 pm-4:05 pm

1 stop27h 40m

Washington, D.C. Dulles Intl

mié. 2/11

7:30 pm-4:55 pm

2 stops16h 25m

$735

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

dom. 1/18

5:30 pm-4:05 pm

1 stop27h 35m

Washington, D.C. Dulles Intl

dom. 1/25

12:23 pm-9:50 am

2 stops16h 27m

$737

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

mié. 2/4

10:20 am-11:06 pm

2 stops17h 46m

Washington, D.C. Dulles Intl

mié. 2/11

7:30 pm-4:55 pm

2 stops16h 25m

$741

CardiffWashington, D.C.

CWL - DCA

CWLDCA

Cardiff Wales

mié. 2/4

10:20 am-10:57 pm

2 stops17h 37m

Washington, D.C. Reagan-National

mié. 2/11

7:30 pm-4:55 pm

2 stops16h 25m

$741

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

dom. 1/18

10:15 am-7:09 pm

2 stops13h 54m

Washington, D.C. Dulles Intl

dom. 1/25

12:40 pm-9:50 am

2 stops16h 10m

$755

CardiffBaltimore

CWL - BWI

CWLBWI

Cardiff Wales

mié. 2/4

10:20 am-9:24 am

2 stops28h 04m

Baltimore/Washington

mié. 2/11

6:59 pm-4:55 pm

2 stops16h 56m

$780

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

mié. 2/4

3:55 pm-3:15 pm

2 stops28h 20m

Washington, D.C. Dulles Intl

mié. 2/11

7:40 pm-8:05 am

3 stops31h 25m

$1,048

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

dom. 1/18

9:20 pm-3:15 pm

2 stops22h 55m

Washington, D.C. Dulles Intl

dom. 1/25

7:40 pm-9:50 am

3 stops33h 10m

$1,060

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

dom. 1/18

10:15 am-2:40 pm

3 stops33h 25m

Washington, D.C. Dulles Intl

dom. 1/25

6:00 pm-9:50 am

3 stops34h 50m

$1,106

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

mié. 2/4

3:55 pm-3:35 pm

1 stop28h 40m

Washington, D.C. Dulles Intl

mié. 2/11

5:05 pm-10:05 am

1 stop12h 00m

$1,134

Flights are sorted by cheapest round-trip flights first.

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See travel insights to Washington, D.C. from

How to get the cheapest flight ticket from Cardiff to Washington, D.C.

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Can stopping save me money on Cardiff to Washington, D.C. flights?

You could potentially save up to 7% on your flight if you consider stops on a Cardiff to Washington, D.C. flight.

When to book flights from Cardiff to Washington, D.C.

Are you open to changing your travel dates? Check out the ideal times to fly from Cardiff to Washington, D.C. 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. (CWL to WAS) flight deals and tips

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

Fastest flight time

17h 37m

Direct flights

None
The fastest flight from Cardiff to Washington, D.C. takes 17h 37m
There are no direct flights from Cardiff to Washington, D.C.. There are no popular flight routes from Cardiff to Washington, D.C..
Search flight deals

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

    A flight from Cardiff Wales to Washington, D.C. will travel around 3537.5 mi. In terms of flight time, this usually takes a little over 17h 37m.

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

    Prices for flights from Cardiff Wales Airport to Washington, D.C. were last updated today.

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

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Cardiff Wales Airport to Washington, D.C..

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

    The travel and health documents required for your trip to Washington, D.C. can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Washington, D.C.. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

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

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

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Cardiff to Washington, D.C. for you.

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

momondo does allow users to show only those flights to Washington, D.C. from Cardiff which offer a flexible booking policy as well as other useful filters and features.

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

Once you have performed a search for Cardiff to Washington, D.C. flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

If you are not ready to book a flight from Cardiff to Washington, D.C. now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Washington, D.C. and let you know when they change.

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Find better results for your trip to the United States

Fly into one of these airports located in Washington, D.C.

Airports listed have a maximum distance of 22.4 mi from Washington, D.C.
Washington, D.C. Reagan-National Airport
Washington, D.C. Dulles Intl Airport