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Cheap flights from Washington, D.C. Dulles Intl Airport to Cardiff from $781

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. Dulles Intl Airport to Cardiff departing on 2/4. 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 Washington, D.C. Dulles Intl Airport to Cardiff

Cheap round-trip flights

Enter your travel dates to find the best prices.
KLM Logo
7:30 pm - 4:55 pm
IAD
-
CWL
16h 25m2 stops
KLM Logo
5:25 pm - 4:05 pm
CWL
-
IAD
27h 40m1 stop
$781KLM
Wed, Feb 4 - Wed, Feb 11
KLM Logo
7:30 pm - 4:55 pm
IAD
-
CWL
16h 25m2 stops
KLM Logo
5:25 pm - 4:05 pm
CWL
-
IAD
27h 40m1 stop
$784KLM
Wed, Feb 4 - Wed, Feb 11
KLM Logo
12:40 pm - 9:50 am
IAD
-
CWL
16h 10m2 stops
KLM Logo
10:20 am - 11:09 pm
CWL
-
IAD
17h 49m2 stops
$786KLM
Thu, Feb 5 - Thu, Feb 12
Virgin Atlantic Logo
6:05 pm - 4:55 pm
IAD
-
CWL
17h 50m1 stop
Virgin Atlantic Logo
10:20 am - 7:09 pm
CWL
-
IAD
13h 49m2 stops
$790Virgin Atlantic
Tue, Feb 3 - Tue, Feb 10
Delta Logo
12:23 pm - 9:50 am
IAD
-
CWL
16h 27m2 stops
Delta Logo
10:20 am - 7:09 pm
CWL
-
IAD
13h 49m2 stops
$794Delta
Tue, Feb 3 - Tue, Feb 10
KLM Logo
12:23 pm - 9:50 am
IAD
-
CWL
16h 27m2 stops
KLM Logo
5:30 pm - 4:05 pm
CWL
-
IAD
27h 35m1 stop
$884KLM
Wed, Jan 7 - Sun, Jan 11
KLM Logo
12:23 pm - 9:50 am
IAD
-
CWL
16h 27m2 stops
KLM Logo
5:30 pm - 7:09 pm
CWL
-
IAD
30h 39m2 stops
$944KLM
Wed, Jan 7 - Sun, Jan 11
Multiple Airlines Logo
7:40 pm - 9:50 am
IAD
-
CWL
33h 10m3 stops
Multiple Airlines Logo
3:55 pm - 3:15 pm
CWL
-
IAD
28h 20m2 stops
$977Multiple Airlines
Wed, Feb 4 - Wed, Feb 11
Multiple Airlines Logo
5:05 pm - 10:05 am
IAD
-
CWL
12h 00m1 stop
Multiple Airlines Logo
3:55 pm - 3:35 pm
CWL
-
IAD
28h 40m1 stop
$994Multiple Airlines
Wed, Feb 4 - Wed, Feb 11
Multiple Airlines Logo
5:05 pm - 10:00 pm
IAD
-
CWL
23h 55m1 stop
Multiple Airlines Logo
10:30 am - 3:35 pm
CWL
-
IAD
34h 05m1 stop
$1,033Multiple Airlines
Thu, Feb 5 - Thu, Feb 12

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

Our best KLM deals on Washington, D.C. Dulles Intl Airport to Cardiff flight tickets
KLM
Feb 4
IAD7:30 pmWashington, D.C. Dulles Intl
16h 25m
2 stops
CWL4:55 pmCardiff Wales
Feb 11
CWL5:25 pmCardiff Wales
27h 40m
1 stop
IAD4:05 pmWashington, D.C. Dulles Intl
$781
Find similar
KLM
Feb 4
IAD7:30 pmWashington, D.C. Dulles Intl
16h 25m
2 stops
CWL4:55 pmCardiff Wales
Feb 11
CWL5:25 pmCardiff Wales
27h 40m
1 stop
IAD4:05 pmWashington, D.C. Dulles Intl
$784
Find similar
KLM
Feb 5
IAD12:40 pmWashington, D.C. Dulles Intl
16h 10m
2 stops
CWL9:50 amCardiff Wales
Feb 12
CWL10:20 amCardiff Wales
17h 49m
2 stops
IAD11:09 pmWashington, D.C. Dulles Intl
$786
Find similar

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

Our best Virgin Atlantic deals on Washington, D.C. Dulles Intl Airport to Cardiff flight tickets
Virgin Atlantic
Feb 3
IAD6:05 pmWashington, D.C. Dulles Intl
17h 50m
1 stop
CWL4:55 pmCardiff Wales
Feb 10
CWL10:20 amCardiff Wales
13h 49m
2 stops
IAD7:09 pmWashington, D.C. Dulles Intl
$790
Find similar
Virgin Atlantic
Jun 13
IAD5:40 pmWashington, D.C. Dulles Intl
18h 05m
1 stop
CWL4:45 pmCardiff Wales
Jul 2
CWL9:45 amCardiff Wales
10h 50m
1 stop
IAD3:35 pmWashington, D.C. Dulles Intl
$3,084
Find similar

momondo Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Wed 2/4

7:30 pm-4:55 pm

2 stops16h 25m

Cardiff Wales

Wed 2/11

5:25 pm-4:05 pm

1 stop27h 40m

$781

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Wed 2/4

7:30 pm-4:55 pm

2 stops16h 25m

Cardiff Wales

Wed 2/11

5:25 pm-4:05 pm

1 stop27h 40m

$784

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Thu 2/5

12:40 pm-9:50 am

2 stops16h 10m

Cardiff Wales

Thu 2/12

10:20 am-11:09 pm

2 stops17h 49m

$786

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Tue 2/3

6:05 pm-4:55 pm

1 stop17h 50m

Cardiff Wales

Tue 2/10

10:20 am-7:09 pm

2 stops13h 49m

$790

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Tue 2/3

12:23 pm-9:50 am

2 stops16h 27m

Cardiff Wales

Tue 2/10

10:20 am-7:09 pm

2 stops13h 49m

$794

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Wed 1/7

12:23 pm-9:50 am

2 stops16h 27m

Cardiff Wales

Sun 1/11

5:30 pm-4:05 pm

1 stop27h 35m

$884

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Wed 1/7

12:23 pm-9:50 am

2 stops16h 27m

Cardiff Wales

Sun 1/11

5:30 pm-7:09 pm

2 stops30h 39m

$944

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Wed 2/4

7:40 pm-9:50 am

3 stops33h 10m

Cardiff Wales

Wed 2/11

3:55 pm-3:15 pm

2 stops28h 20m

$977

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Wed 2/4

5:05 pm-10:05 am

1 stop12h 00m

Cardiff Wales

Wed 2/11

3:55 pm-3:35 pm

1 stop28h 40m

$994

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Thu 2/5

5:05 pm-10:00 pm

1 stop23h 55m

Cardiff Wales

Thu 2/12

10:30 am-3:35 pm

1 stop34h 05m

$1,033

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to Cardiff from

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

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

What is the cheapest day to depart on your flight to Cardiff?

The cheapest day to depart on your flight to Cardiff is on a Tuesday when prices can be found for as low as $766. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Friday because tickets tend to average around $1,282. These prices are subject to change though, so be sure to set up a Price Alert for flights to Cardiff.

What is the cheapest time of day to depart on your flight to Cardiff?

Flying to Cardiff from Washington, D.C. Dulles Intl Airport in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $799 when looking at flights departing in the afternoon. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $809 on average. Flights to Cardiff from Washington, D.C. Dulles Intl Airport at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

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

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

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

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

Fastest flight time

10h 40m

Direct flights

None
The fastest flight from Washington, D.C. Dulles Intl Airport to Cardiff takes 10h 40m
There are no direct flights from Washington, D.C. Dulles Intl Airport to Cardiff. There are no popular flight routes from Washington, D.C. Dulles Intl Airport to Cardiff.
Search flight deals

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

    Cardiff Wales is 3552.6 mi away from Washington, D.C. Dulles Intl. In terms of flight time, this usually takes a little over 10h 40m.

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

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

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

  • What documentation or ID do you need to fly to Cardiff Wales Airport?

    The necessary travel and health documents for your Cardiff Wales 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.

Why use momondo?

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

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 Cardiff from Washington, D.C..

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

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

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

Once you have performed a search for Washington, D.C. to Cardiff 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 Washington, D.C. to Cardiff right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Washington, D.C. to Cardiff flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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Aer Lingus