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Cheap flights from Washington, D.C. Dulles Intl Airport to Cardiff from $769

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 10/13. 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 Washington, D.C. Dulles Intl Airport to Cardiff

Cheap round-trip flights

KLM Logo
5:25 pm - 4:45 pmIAD-CWL
18h 20m1 stop
KLM Logo
5:15 pm - 3:35 pmCWL-IAD
27h 20m1 stop
$769KLM
Find Deal
Mon, Oct 13 - Wed, Oct 22
KLM Logo
12:27 pm - 9:15 amIAD-CWL
15h 48m2 stops
KLM Logo
5:15 pm - 3:35 pmCWL-IAD
27h 20m1 stop
$773KLM
Find Deal
Mon, Oct 13 - Wed, Oct 22
Delta Logo
6:05 pm - 9:50 amIAD-CWL
10h 45m1 stop
Delta Logo
10:20 am - 5:04 pmCWL-IAD
35h 44m2 stops
$778Delta
Find Deal
Wed, Nov 12 - Sun, Nov 16
Delta Logo
7:05 pm - 9:50 amIAD-CWL
10h 45m1 stop
Delta Logo
10:20 am - 12:18 amCWL-IAD
18h 58m2 stops
$779Delta
Find Deal
Thu, Oct 30 - Thu, Nov 13
KLM Logo
1:00 pm - 9:50 amIAD-CWL
15h 50m2 stops
KLM Logo
5:25 pm - 4:05 pmCWL-IAD
27h 40m1 stop
$781KLM
Find Deal
Wed, Feb 4 - Wed, Feb 11
KLM Logo
12:27 pm - 9:15 amIAD-CWL
15h 48m2 stops
KLM Logo
9:50 am - 11:40 pmCWL-IAD
18h 50m2 stops
$783KLM
Find Deal
Mon, Oct 13 - Wed, Oct 22
Multiple Airlines Logo
10:55 pm - 3:35 pmIAD-CWL
35h 40m3 stops
Multiple Airlines Logo
11:30 pm - 3:50 pmCWL-IAD
21h 20m2 stops
$816Multiple Airlines
Find Deal
Mon, Nov 3 - Mon, Nov 10
Multiple Airlines Logo
5:25 pm - 4:45 pmIAD-CWL
18h 20m1 stop
Multiple Airlines Logo
5:15 pm - 4:05 pmCWL-IAD
27h 50m1 stop
$826Multiple Airlines
Find Deal
Thu, Oct 23 - Mon, Nov 3
Virgin Atlantic Logo
7:05 pm - 9:50 amIAD-CWL
10h 45m1 stop
Virgin Atlantic Logo
5:25 pm - 4:05 pmCWL-IAD
27h 40m1 stop
$905Virgin Atlantic
Find Deal
Sat, Nov 1 - Sat, Nov 8
Air France Logo
9:20 pm - 5:05 pmIAD-CWL
14h 45m2 stops
Air France Logo
10:20 am - 7:15 pmCWL-IAD
13h 55m2 stops
$1,070Air France
Find Deal
Fri, Oct 24 - Sun, Nov 2

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
Oct 13
IAD5:25 pmWashington, D.C. Dulles Intl
18h 20m
1 stop
CWL4:45 pmCardiff Wales
Oct 22
CWL5:15 pmCardiff Wales
27h 20m
1 stop
IAD3:35 pmWashington, D.C. Dulles Intl
$769
Find similar
KLM
Oct 13
IAD12:27 pmWashington, D.C. Dulles Intl
15h 48m
2 stops
CWL9:15 amCardiff Wales
Oct 22
CWL5:15 pmCardiff Wales
27h 20m
1 stop
IAD3:35 pmWashington, D.C. Dulles Intl
$773
Find similar
KLM
Feb 4
IAD1:00 pmWashington, D.C. Dulles Intl
15h 50m
2 stops
CWL9:50 amCardiff Wales
Feb 11
CWL5:25 pmCardiff Wales
27h 40m
1 stop
IAD4:05 pmWashington, D.C. Dulles Intl
$781
Find similar

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

Our best Delta deals on Washington, D.C. Dulles Intl Airport to Cardiff flight tickets
Delta
Nov 12
IAD6:05 pmWashington, D.C. Dulles Intl
10h 45m
1 stop
CWL9:50 amCardiff Wales
Nov 16
CWL10:20 amCardiff Wales
35h 44m
2 stops
IAD5:04 pmWashington, D.C. Dulles Intl
$778
Find similar
Delta
Oct 30
IAD7:05 pmWashington, D.C. Dulles Intl
10h 45m
1 stop
CWL9:50 amCardiff Wales
Nov 13
CWL10:20 amCardiff Wales
18h 58m
2 stops
IAD12:18 amWashington, D.C. Dulles Intl
$779
Find similar
Delta
Nov 3
IAD5:52 pmWashington, D.C. Dulles Intl
18h 03m
2 stops
CWL4:55 pmCardiff Wales
Nov 10
CWL10:20 amCardiff Wales
13h 48m
2 stops
IAD7:08 pmWashington, D.C. Dulles Intl
$833
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 September 18, 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

Mon 10/13

5:25 pm-4:45 pm

1 stop18h 20m

Cardiff Wales

Wed 10/22

5:15 pm-3:35 pm

1 stop27h 20m

$769

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Mon 10/13

12:27 pm-9:15 am

2 stops15h 48m

Cardiff Wales

Wed 10/22

5:15 pm-3:35 pm

1 stop27h 20m

$773

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Wed 11/12

6:05 pm-9:50 am

1 stop10h 45m

Cardiff Wales

Sun 11/16

10:20 am-5:04 pm

2 stops35h 44m

$778

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Thu 10/30

7:05 pm-9:50 am

1 stop10h 45m

Cardiff Wales

Thu 11/13

10:20 am-12:18 am

2 stops18h 58m

$779

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Wed 2/4

1:00 pm-9:50 am

2 stops15h 50m

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

Mon 10/13

12:27 pm-9:15 am

2 stops15h 48m

Cardiff Wales

Wed 10/22

9:50 am-11:40 pm

2 stops18h 50m

$783

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Mon 11/3

10:55 pm-3:35 pm

3 stops35h 40m

Cardiff Wales

Mon 11/10

11:30 pm-3:50 pm

2 stops21h 20m

$816

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Thu 10/23

5:25 pm-4:45 pm

1 stop18h 20m

Cardiff Wales

Mon 11/3

5:15 pm-4:05 pm

1 stop27h 50m

$826

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Sat 11/1

7:05 pm-9:50 am

1 stop10h 45m

Cardiff Wales

Sat 11/8

5:25 pm-4:05 pm

1 stop27h 40m

$905

Washington, D.C.Cardiff

IAD - CWL

IADCWL

Washington, D.C. Dulles Intl

Fri 10/24

9:20 pm-5:05 pm

2 stops14h 45m

Cardiff Wales

Sun 11/2

10:20 am-7:15 pm

2 stops13h 55m

$1,070

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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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

Direct flights

None
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.
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  • 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 35m.

  • 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 many operators does momondo search for flights from Washington, D.C. Dulles Intl Airport to Cardiff Wales Airport?

  • 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.

  • What is the most popular airline from Washington, D.C. Dulles Intl Airport to Cardiff?

Best airlines flying from Washington, D.C. Dulles Intl Airport to Cardiff

Compare and see reviews for airlines that fly from Washington, D.C. Dulles Intl Airport to Cardiff with momondo
Airline
Rating
Free Cancellation
Price
KLMPriceFrom $765Free CancellationRating
7.8
1,386 reviews
Search KLM flights

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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