Cheap Flights from Washington Dulles to London

Compare Washington Dulles to London flight deals

Find the cheapest month or even day of the year to fly to London

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Flight deals from Washington Dulles to London

Looking for a cheap last-minute deal or the best return flight from Washington Dulles Airport to London? If you want to travel next month, return fares start from R 11,160. Find the lowest prices on one-way and return tickets right here.

London.R 4,477 per passenger.Departing Mon, 19 Oct.One-way flight with TAP Air Portugal.Outbound indirect flight with TAP Air Portugal, departs from Washington Dulles on Mon, 19 Oct, arriving in London Stansted.Price includes taxes and charges.From R 4,477, select.

London.R 4,639 per passenger.Departing Mon, 20 Jul.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Dulles on Mon, 20 Jul, arriving in London Gatwick.Price includes taxes and charges.From R 4,639, select.

London.R 4,682 per passenger.Departing Sun, 29 Nov.One-way flight with TAP Air Portugal.Outbound indirect flight with TAP Air Portugal, departs from Washington Dulles on Sun, 29 Nov, arriving in London Gatwick.Price includes taxes and charges.From R 4,682, select.

London.R 4,972 per passenger.Departing Sun, 6 Dec.One-way flight with TAP Air Portugal.Outbound indirect flight with TAP Air Portugal, departs from Washington Dulles on Sun, 6 Dec, arriving in London Gatwick.Price includes taxes and charges.From R 4,972, select.

London.R 5,144 per passenger.Departing Mon, 7 Sep.One-way flight with TAP Air Portugal.Outbound indirect flight with TAP Air Portugal, departs from Washington Dulles on Mon, 7 Sep, arriving in London Stansted.Price includes taxes and charges.From R 5,144, select.

London.R 5,227 per passenger.Departing Mon, 17 Aug.One-way flight with TAP Air Portugal.Outbound indirect flight with TAP Air Portugal, departs from Washington Dulles on Mon, 17 Aug, arriving in London Stansted.Price includes taxes and charges.From R 5,227, select.

London.R 5,283 per passenger.Departing Mon, 27 Apr.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Washington Dulles on Mon, 27 Apr, arriving in London Stansted.Price includes taxes and charges.From R 5,283, select.

London.R 5,315 per passenger.Departing Sat, 20 Jun.One-way flight with Allegiant Air.Outbound indirect flight with Allegiant Air, departs from Washington Dulles on Sat, 20 Jun, arriving in London Stansted.Price includes taxes and charges.From R 5,315, select.

London.R 5,350 per passenger.Departing Fri, 15 Jan.One-way flight with TAP Air Portugal.Outbound indirect flight with TAP Air Portugal, departs from Washington Dulles on Fri, 15 Jan, arriving in London Gatwick.Price includes taxes and charges.From R 5,350, select.

London.R 5,422 per passenger.Departing Sat, 2 May.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Washington Dulles on Sat, 2 May, arriving in London Stansted.Price includes taxes and charges.From R 5,422, select.

London.R 6,677 per passenger.Departing Wed, 24 Mar.One-way flight with TAP Air Portugal.Outbound indirect flight with TAP Air Portugal, departs from Washington Dulles on Wed, 24 Mar, arriving in London Gatwick.Price includes taxes and charges.From R 6,677, select.

London.R 6,999 per passenger.Departing Fri, 26 Feb.One-way flight with TAP Air Portugal.Outbound indirect flight with TAP Air Portugal, departs from Washington Dulles on Fri, 26 Feb, arriving in London Gatwick.Price includes taxes and charges.From R 6,999, select.

London.R 7,675 per passenger.Departing Thu, 1 Apr.One-way flight with TAP Air Portugal.Outbound indirect flight with TAP Air Portugal, departs from Washington Dulles on Thu, 1 Apr, arriving in London Heathrow.Price includes taxes and charges.From R 7,675, select.

London.R 7,929 per passenger.Departing Tue, 22 Sep.One-way flight with KLM.Outbound direct flight with KLM departs from Washington Dulles on Tue, 22 Sep, arriving in London Heathrow.Price includes taxes and charges.From R 7,929, select.

London.R 8,032 per passenger.Departing Mon, 24 Aug.One-way flight with Lufthansa.Outbound direct flight with Lufthansa departs from Washington Dulles on Mon, 24 Aug, arriving in London Heathrow.Price includes taxes and charges.From R 8,032, select.

London.R 8,151 per passenger.Departing Tue, 3 Nov.One-way flight with Air France.Outbound direct flight with Air France departs from Washington Dulles on Tue, 3 Nov, arriving in London Heathrow.Price includes taxes and charges.From R 8,151, select.

Find the cheapest month to fly from Washington Dulles to London

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

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Direct flights from Washington Dulles to London

Alternative Washington Dulles to London routes

Looking for the cheapest, fastest or easiest route from Washington Dulles to London? You could fly into the following airports instead.

Washington D.C. to London: Flight information

The things to know before you go.

Cheapest flight found	R 4,477
Cheapest month to fly	October
Average flight time	7 hrs, 28 mins
Most popular airline	British Airways
Average flights per week	544

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

How many airports are there in London?

There are 6 airports in London: London City, London Heathrow, London Gatwick, London Luton, London Stansted, and London Southend.

How much are return flights from Washington Dulles to London?

The best price we found for a return flight from Washington Dulles to London is R 10,651. 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.

How long does it take to fly from Washington Dulles to London?

7 hours and 28 minutes is the average flight time from Washington Dulles to London.

Which airlines fly direct from Washington Dulles to London?

British Airways, American Airlines and Aer Lingus fly direct from Washington Dulles to London.

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

As of April 2026, there are 544 flights per week flying from Washington Dulles to London.

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

The cheapest month to fly from Washington Dulles to London is usually July.

Which is the cheapest airport to fly into in London?

If you're flying from Washington Dulles Airport, the cheapest airport near London is London Gatwick – which is 40.3 km away from the centre of London. We've found flights into this airport from R 10,651.

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

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Washington Dulles Airport to London on Thursday, 23 July 2026.

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

Yes – the average flight time is 7 hours and 28 minutes.

How can I get the best flight deal from Washington Dulles Airport to London?

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 London 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 London?

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

What’s the weather like in London?

In April, the average temperature is usually around 9°C. August is typically the warmest month in London, when it usually averages around 22°C. You can expect the least rain in March. The coldest month is January, with temperatures averaging 1°C. The rainiest month is October.

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

Currently, Frontier Airlines and British Airways offer the cheapest flight tickets to London.

Flying from Washington Dulles International Airport (IAD) to London: what you need to know

Approximately 8 hours 25 minutes is how long you can expect to be in the air on a direct flight from Washington Dulles International Airport to London.
London is five hours ahead of Washington DC, where Washington Dulles International Airport is located. London follows the UTC+0 timezone.
The busiest route is from Washington Dulles International Airport (IAD) to London Heathrow Airport (LHR). Choose from 38 weekly services between these two airports. If you'd like to head off as soon as possible, the earliest flight from IAD to LHR is the 17:40 British Airways service. If you prefer travelling later, the final departure is at 23:50 with United Airlines.
To avoid rushing for your IAD to London flight, leave enough time to check in and drop off your luggage. Arriving two hours ahead of international departures and an hour before domestic flights is the general rule.
During popular months such as June, it's wise to get to the airport earlier than usual. Plan to arrive two hours before a domestic departure and four hours ahead for international flights when you fly during high season in general.
You can book a direct Washington Dulles International Airport to London ticket. Start your journey at IAD and arrive at London Heathrow Airport (LHR).
You can choose from a variety of airlines that offer direct flights from Washington Dulles International Airport to London, such as:
Stopovers are the perfect opportunity to break up your trip and maybe even tick off a new city. When browsing for plane tickets from IAD to London, deselect the 'Direct flights only' box to see where you can stop along the way. Top options include:
- Amsterdam Schiphol Airport (AMS)
- Paris Charles de Gaulle Airport (CDG)
- New York John F. Kennedy International Airport (JFK)
The journey from central Washington DC to IAD takes about 1 hour 10 minutes on public transport. If you drive, ride-share or get a taxi, you'll cover the 40 kilometres in 45 minutes or so, depending on traffic.
Searching for a hotel close to IAD? If you're boarding an early flight from Washington Dulles International Airport to London, these stays will get you from your pillow to the plane in no time:
When it comes to Washington Dulles International Airport's on-time performance, 77% of flights stick to their scheduled arrival time.
IAD's address is 1 Saarinen Circle.

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

R 4,477 is currently the lowest price for a one-way Washington Dulles International Airport to London flight. A return plane ticket starts from R 10,651. These fares can change based on demand.
Score cheap flights from IAD to London by booking two months ahead. Based on our research, that's the best time for bagging a bargain.
Plan your trip for July. That's the best month for landing an awesome deal on Washington Dulles International Airport to London tickets. If you have flexibility with your dates, use the 'Whole month' tool to access the cheapest price across each month.
You don't need to check back constantly to find out if fares have dropped when you set up a Price Alert. We'll notify you when there's an updated deal for cheap flights from IAD to London.
Tailor your trip with filters. Choose your preferred departure and arrival times, airlines and total journey duration. You can also sort results by 'Best,' 'Cheapest' or 'Fastest' flights from Washington Dulles International Airport to London.

Airports in London

London Heathrow Airport (LHR)

The distance from London Heathrow Airport (LHR) to central London is roughly 24 kilometres. It takes about 45 minutes to get to the centre driving.
If you're taking public transport, expect a journey time of about 25 minutes.
The last thing you need is a long journey to your hotel if you're getting in late on a flight from Washington Dulles International Airport to London. Stay at one of these accommodation options near LHR instead:
Reserving your vehicle from London Heathrow Airport about one week before your flight from IAD to London can help you secure the lowest rate.

London Gatwick Airport (LGW)

London Gatwick Airport (LGW) is around 48 kilometres from central London. After your flight from Washington Dulles International Airport to London, it'll take you around 1 hour 5 minutes to get to the heart of the city in a taxi or ride-share.
You can expect the journey to take about 1 hour 20 minutes on public transport.
There are some comfortable places ready to welcome you near LGW. Kick back and get cosy after your IAD to London flight at one of these perfectly located options:
Score the best price by booking your ride from LGW three weeks ahead of time. You can also expect to have a wider range of vehicles.

London Stansted Airport (STN)

London Stansted Airport (STN) is around 56 kilometres from the centre of London. It'll take you about 1 hour 5 minutes to reach the city centre by ride-share or taxi once you've hopped off your flight from Washington Dulles International Airport to London.
Public transport can take you there in around 45 minutes.
If you don't want to make the trip to the centre, head for a hotel near STN. Get settled at one of these stays after your IAD to London flight:
If you're searching for a specific type of vehicle, lock in your ride from STN around four weeks before your flight from Washington Dulles International Airport to London. This gives you a higher chance of getting your preferred car, as well as a better deal.

Best time to go to London

July is the busiest month for flights from Washington Dulles International Airport to London. To avoid the crowds, head to London in January.
Lock in a Washington Dulles International Airport to London plane ticket with a departure in July to visit the city during its warmest month. You can expect temperatures to range from 11ºC (52ºF) to 26ºC (79ºF).
January sees average temperatures of between 0ºC (32ºF) and 9ºC (48ºF). Look for a cheap ticket from IAD to London around that time if you want to travel in cooler conditions.

More about London

When it comes to looking for somewhere to lay your head, you'll find the most popular stays in London right here. Check out these hotels after you've booked your flight from Washington Dulles International Airport to London:
There are so many things to discover in this city it can be difficult to know where to begin. Westminster Abbey, The British Museum and Big Ben are top sights which should feature on any good London itinerary.

Explore more of the United Kingdom

London has plenty to offer, but there are so many other corners of the United Kingdom you should also see. About 257 kilometres northwest of London, a visit to Manchester will fill your itinerary to the brim. Don't miss top attractions like Manchester United Museum & Stadium Tour, The Homes of Football and Museum of Science and Industry.
Birmingham is another essential stop in the United Kingdom and is around 161 kilometres northwest of London. No journey is complete without visiting Birmingham Museum & Art Gallery, Birmingham Hippodrome Theatre and Bournville Experience.