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Cheap flights from Cardiff to Washington, D.C. Dulles Intl Airport from £510

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 17/5. Fares are subject to change and may not be available on all flights or dates of travel.
CWL — IAD
8 Apr — 15 Apr1
1 adult

Cheap flight deals from Cardiff to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from Cardiff (CWL) to Dulles Intl (IAD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 3 April 2025.

Round-trip from

£510
17/5-24/5
  • 17/5-24/5
  • 2 total stops
  • 21h 00m total
  • Cardiff to Washington, D.C.
Search Deals

Find flight deals from Cardiff to Dulles Intl

Cheapest flights from Cardiff to Dulles Intl
Explore the most affordable flight options available from Cardiff to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 3 April 2025.

Sat 17/509:00CWL - IAD
1 stop11h 50mMultiple Airlines
Sat 24/520:25IAD - CWL
1 stop9h 10mMultiple Airlines
Deal found 2/4£510
Sat 28/617:35CWL - IAD
1 stop27h 00mKLM
Sat 19/717:25IAD - CWL
1 stop10h 50mKLM
Deal found 2/4£805

Cheapflights Fare Finder

Customise your flight search to find flights from Cardiff to Dulles Intl 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, Cheapflights users made 858,174 searches. Data last updated 3 April 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

Cardiff

Fly to

Dulles Intl

Route

Depart

Return

Price

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Sat 17/5

09:00-15:50

1 stop11h 50m

Washington, D.C. Dulles Intl

Sat 24/5

20:25-10:35

1 stop9h 10m

£510

CardiffWashington, D.C.

CWL - IAD

CWLIAD

Cardiff Wales

Sat 28/6

17:35-15:35

1 stop27h 00m

Washington, D.C. Dulles Intl

Sat 19/7

17:25-09:15

1 stop10h 50m

£805

Flights are sorted by cheapest return flights first.

Deals found on 2/4

Best time to book a flight from Cardiff to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Cardiff with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Cardiff to Washington, D.C. Dulles Intl Airport

What is the cheapest month to book a flight from Cardiff to Washington, D.C. Dulles Intl Airport?

Currently, January is the cheapest month in which you can book a flight from Cardiff to Washington, D.C. Dulles Intl Airport (average of £599). Flying from Cardiff to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of £947). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Rainfall in Dulles Intl by month

Plan your trip to Dulles Intl by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 66.0 - 102.0 inches per month. May is typically the wettest month, when rainfall can reach 102.0 mm. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 66.0 mm.

Temperature in Dulles Intl by month

Plan your trip to Dulles Intl by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 27.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 2.0 C).

Reviews of airlines servicing Dulles Intl

Get insights into the airlines that provide service to Dulles Intl. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Dulles Intl. Reviews last updated 3 April 2025.
KLM
7.8
Good
1,323 reviews
Check prices

Boarding

7.8

Comfort

7.7

Overall

7.8

Crew

8.4

Food

7.3

Entertainment

7.2

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.
KLM
7.8
Good
1,323 reviews
KLM
7.8
Good
1,323 reviews
Check prices

Boarding

7.8

Comfort

7.7

Overall

7.8

Crew

8.4

Food

7.3

Entertainment

7.2

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.

Related info for your journey

Find useful and relevant information for your journey from Cardiff to Dulles Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Cardiff to Washington, D.C. Dulles Intl?

    For a flight from Cardiff to Washington, D.C. Dulles Intl, you will be flying from Cardiff Wales. Cardiff Wales (CWL) is just 9.1 mi from the center of the city. Cardiff Wales is the only Cardiff airport and it handles 0 outbound flights to Washington, D.C. Dulles Intl per day. 0 airlines have flights to Washington, D.C. Dulles Intl from Cardiff Wales on a regular basis.

  • Can I find deals for flights from Cardiff to Dulles Intl that include hotel bookings?

    Yes. In addition to deals on Cardiff to Dulles Intl flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Cardiff to Dulles Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Cardiff to Dulles Intl.

  • Can I find deals for business class flights from Cardiff to Dulles Intl?

    Yes. Cheapflights offers flight deals from Cardiff to Dulles Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Cardiff to Washington, D.C. Dulles Intl Airport?

    Currently, January is the cheapest month in which you can book a flight from Cardiff to Washington, D.C. Dulles Intl Airport (average of £599). Flying from Cardiff to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of £947). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near Cardiff?

Book flights to Cardiff if you plan to visit one of these locations
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Can Cheapflights notify me if prices for flights from Cardiff to Dulles Intl become cheaper?

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