Cheap Flights from Cardiff to Washington Dulles

Compare Cardiff to Washington Dulles flight deals

Find the cheapest month or even day of the year to fly to Washington Dulles

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Flight deals from Cardiff Airport to Washington Dulles Airport

Looking for a cheap last-minute deal or the best return flight from Cardiff Airport to Washington Dulles Airport? If you want to travel next month, return fares start from $1,715. Find the lowest prices on one-way and return tickets right here.

Washington D.C..$1,715 per passenger.Departing Tue, 21 Apr, returning Tue, 28 Apr.Return flight with Air France.Outbound indirect flight with Air France, departs from Cardiff on Tue, 21 Apr, arriving in Washington Dulles.Inbound indirect flight with Air France, departs from Washington Dulles on Tue, 28 Apr, arriving in Cardiff.Price includes taxes and charges.From $1,715, select.

Washington D.C..$1,783 per passenger.Departing Fri, 13 Nov, returning Thu, 19 Nov.Return flight with KLM.Outbound indirect flight with KLM, departs from Cardiff on Fri, 13 Nov, arriving in Washington Dulles.Inbound indirect flight with KLM, departs from Washington Dulles on Thu, 19 Nov, arriving in Cardiff.Price includes taxes and charges.From $1,783, select.

Washington D.C..$1,784 per passenger.Departing Sat, 5 Sep, returning Mon, 21 Sep.Return flight with Delta.Outbound indirect flight with Delta, departs from Cardiff on Sat, 5 Sep, arriving in Washington Dulles.Inbound indirect flight with Delta, departs from Washington Dulles on Mon, 21 Sep, arriving in Cardiff.Price includes taxes and charges.From $1,784, select.

Washington D.C..$1,852 per passenger.Departing Fri, 24 Apr, returning Fri, 1 May.Return flight with Delta.Outbound indirect flight with Delta, departs from Cardiff on Fri, 24 Apr, arriving in Washington Dulles.Inbound indirect flight with Delta, departs from Washington Dulles on Fri, 1 May, arriving in Cardiff.Price includes taxes and charges.From $1,852, select.

Washington D.C..$1,918 per passenger.Departing Thu, 28 May, returning Wed, 16 Sep.Return flight with Delta.Outbound indirect flight with Delta, departs from Cardiff on Thu, 28 May, arriving in Washington Dulles.Inbound indirect flight with Delta, departs from Washington Dulles on Wed, 16 Sep, arriving in Cardiff.Price includes taxes and charges.From $1,918, select.

Washington D.C..$2,056 per passenger.Departing Thu, 11 Jun, returning Mon, 15 Jun.Return flight with Delta.Outbound indirect flight with Delta, departs from Cardiff on Thu, 11 Jun, arriving in Washington Dulles.Inbound indirect flight with Delta, departs from Washington Dulles on Mon, 15 Jun, arriving in Cardiff.Price includes taxes and charges.From $2,056, select.

Washington D.C..$2,804 per passenger.Departing Mon, 11 May, returning Fri, 15 May.Return flight with Delta.Outbound indirect flight with Delta, departs from Cardiff on Mon, 11 May, arriving in Washington Dulles.Inbound indirect flight with Delta, departs from Washington Dulles on Fri, 15 May, arriving in Cardiff.Price includes taxes and charges.From $2,804, select.

Washington D.C..$3,020 per passenger.Departing Wed, 11 Mar, returning Mon, 16 Mar.Return flight with KLM.Outbound indirect flight with KLM, departs from Cardiff on Wed, 11 Mar, arriving in Washington Dulles.Inbound indirect flight with KLM, departs from Washington Dulles on Mon, 16 Mar, arriving in Cardiff.Price includes taxes and charges.From $3,020, select.

Find the cheapest month to fly from Cardiff to Washington Dulles

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Cardiff to Washington Dulles flights are currently cheapest in April.

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Cardiff to Washington Dulles: Alternative routes

Compare routes from Cardiff to Washington D.C. below. You may find an airport to fly into that's cheaper, faster, or easier than Washington Dulles.

Cardiff to Washington D.C.: Flight information

The things to know before you go.

Cheapest flight found	$1,715
Cheapest month to fly	April

Check out these Washington D.C. hotels

Ready to plan your stay? Other travellers rate these Washington D.C. hotels for cleanliness, service and location.

Hotel AKA Washington Circle

1.51 km from city centre

$744

Per night

Sixty DC

1.17 km from city centre

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Hotel Hive

1.53 km from city centre

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Per night

Hotel AKA Washington Circle

1.51 km from city centre

$744

Per night

Sixty DC

1.17 km from city centre

$873

Per night

Hotel Hive

1.53 km from city centre

$687

Per night

Explore top-rated hotels

Finding cheap flights from Cardiff to Washington Dulles: Frequently asked questions

How much are return flights from Cardiff to Washington Dulles?

The best price we found for a return flight from Cardiff to Washington Dulles is $1,715. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.

Which airlines fly direct from Cardiff to Washington Dulles?

Currently, there are no airlines that fly direct from Cardiff to Washington Dulles. But we found flights with one or more stops from $1,715.

How many flights are there a week from Cardiff to Washington Dulles?

As of March 2026, there are no flights flying from Cardiff to Washington Dulles.

When is the cheapest time to fly from Cardiff to Washington Dulles?

The cheapest month to fly from Cardiff to Washington Dulles is usually April.

Which upcoming date is cheapest to fly from Cardiff Airport to Washington Dulles Airport on?

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Cardiff Airport to Washington Dulles Airport on Tuesday, 21 April 2026.

Can I get a direct flight from Cardiff Airport to Washington Dulles Airport?

No airlines currently offer direct flights between Cardiff Airport and Washington Dulles Airport. Most routes have one or more stops.

How can I find the best flight deal to Washington Dulles?

We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Washington Dulles but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

When is the best time to book flights to Washington D.C.?

We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Washington D.C. is around 40 days in advance, so don’t leave your flight to the last minute.

Which is the cheapest airline to fly from Cardiff Airport to Washington Dulles with?

Currently, Air France offers the cheapest flight tickets to Washington Dulles.

Travelling from Cardiff Airport (CWL) to Washington Dulles International Airport (IAD): what you need to know

The timezone in Washington DC is UTC-4, which is four hours behind Cardiff.
To ensure you catch your CWL to IAD flight, leave plenty of time for things like baggage drop and finding your gate. Turning up two hours ahead of international departures and one hour before domestic flights is the standard rule.
During popular months such as June, it's best to get to the airport earlier than normal. Plan to arrive two hours before domestic departures and four hours ahead of international flights whenever you're flying during peak periods in general.
If you want to explore another city along the way, simply uncheck 'Direct flights only' when searching for your ticket from Cardiff Airport to Washington Dulles International Airport. These are the most popular stopovers between CWL and IAD:
- Dublin Airport
- Amsterdam Airport Schiphol
- Keflavik International Airport

How to find the cheapest flights from Cardiff Airport (CWL) to Washington Dulles International Airport (IAD)

$2,899 is the lowest price for a one-way Cardiff Airport to Washington Dulles International Airport flight. Return flights start from $1,715. These fares may change depending on demand and availability.
It's often best to book ahead of time if you want to get cheap tickets from CWL to IAD. That's because airlines change prices based on demand, which tends to rise closer to the date of departure.
Finding cheap flights from Cardiff Airport to Washington Dulles International Airport is easy if you're flexible with your travel plans. Use the 'Whole month' search function to see the best prices across every month and land a great deal.
Getting your hands on cheap flights from CWL to IAD is easy with Price Alerts. Simply create one of these automatic alerts and we'll let you know when a new discounted fare appears.
Find the ideal flight for you by using the filters. To see the 'Fastest,' 'Cheapest' or 'Best' flights from Cardiff Airport to Washington Dulles International Airport, use the 'Sort by' function. You can also filter by arrival and departure times, airline, and number of stops.

Handy information about Cardiff Airport (CWL)

Of the departures from Cardiff Airport, 66.16% land on schedule at their destination.
Central Cardiff to Cardiff Airport is around 27 kilometres. Depending on traffic, it'll take you about 30 minutes to get there if you're driving, ride-sharing or catching a cab.
You can expect a journey time of about 1 hour 5 minutes when using public transport.
Get your travels off to a stress-free start by staying near CWL. Whether you're catching an early flight from Cardiff Airport to Washington Dulles International Airport or just don't like being rushed, these hotels are perfect:

Arriving at Washington Dulles International Airport (IAD)

Consider booking a hotel near IAD if you're catching a late Cardiff Airport to Washington Dulles International Airport flight. Settle into one of these accommodation options and make your arrival easier:
Pick up a Washington Dulles International Airport rental car and discover Washington DC and beyond with your own set of wheels. Dollar, Thrifty and Sixt are popular providers you can book with here.
Lock in the best possible rate by booking your vehicle from Washington Dulles International Airport about one week before your departure date.

Getting from Washington Dulles International Airport (IAD) to central Washington DC

You'll find IAD at 1 Saarinen Circle.
Washington Dulles International Airport is roughly 56 kilometres from the centre of Washington DC. The drive time takes about 50 minutes.
When travelling on public transport, expect a journey of about 3 hours 25 minutes.

When to fly to Washington Dulles International Airport (IAD)

It's time to plan your dates for your flight from Cardiff Airport to Washington Dulles International Airport. April is the busiest month to visit Washington DC. If you're after a more laid-back vibe, go in January.
When reserving your flight from Cardiff Airport to Washington Dulles International Airport, think about the kind of weather you like. July is the warmest month in Washington DC, with the temperature ranging from 19ºC to 33ºC.
January has average temperatures of between -6ºC and 10ºC. Look for cheap tickets from CWL to IAD around that time if you like travelling in cooler conditions.

Explore more of United States

You've done Washington DC, now it's time to explore other parts of United States. Journey about 322 kilometres north-east to New York to check off its leading sights. From Statue of Liberty to Central Park and Empire State Building, you've got a jam-packed schedule ahead.
If you're looking to explore another side of United States, consider Philadelphia, about 193 kilometres north-east of Washington DC. Liberty Bell, Independence Hall and Philadelphia Museum of Art are the start of reasons to visit.