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 to London? Find the lowest prices on one-way and return tickets right here.

London.R 3,032 per passenger.Departing Mon, 26 Jan.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Dulles on Mon, 26 Jan, arriving in London Gatwick.Price includes taxes and charges.From R 3,032, select.

London.R 3,123 per passenger.Departing Sun, 15 Feb.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Dulles on Sun, 15 Feb, arriving in London Gatwick.Price includes taxes and charges.From R 3,123, select.

London.R 3,308 per passenger.Departing Sun, 1 Mar.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Dulles on Sun, 1 Mar, arriving in London Gatwick.Price includes taxes and charges.From R 3,308, select.

London.R 3,487 per passenger.Departing Wed, 1 Apr.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Dulles on Wed, 1 Apr, arriving in London Gatwick.Price includes taxes and charges.From R 3,487, select.

London.R 3,808 per passenger.Departing Mon, 10 Aug.One-way flight with TAP Air Portugal.Outbound indirect flight with TAP Air Portugal, departs from Washington Dulles on Mon, 10 Aug, arriving in London Stansted.Price includes taxes and charges.From R 3,808, select.

London.R 4,257 per passenger.Departing Tue, 28 Jul.One-way flight with TAP Air Portugal.Outbound indirect flight with TAP Air Portugal, departs from Washington Dulles on Tue, 28 Jul, arriving in London Gatwick.Price includes taxes and charges.From R 4,257, select.

London.R 4,681 per passenger.Departing Sat, 5 Sep.One-way flight with TAP Air Portugal.Outbound indirect flight with TAP Air Portugal, departs from Washington Dulles on Sat, 5 Sep, arriving in London Stansted.Price includes taxes and charges.From R 4,681, select.

London.R 4,925 per passenger.Departing Sun, 25 Oct.One-way flight with TAP Air Portugal.Outbound indirect flight with TAP Air Portugal, departs from Washington Dulles on Sun, 25 Oct, arriving in London Heathrow.Price includes taxes and charges.From R 4,925, 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 January.

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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 3,032
Cheapest month to fly	January
Average flight time	7 hrs, 27 mins
Most popular airline	American Airlines
Average flights per week	506

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 6,785. 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 27 minutes is the average flight time from Washington Dulles to London.

Which airlines fly direct from Washington Dulles to London?

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

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

As of January 2026, there are 506 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 January.

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 Heathrow – which is 22.9 km away from the centre of London. We've found flights into this airport from R 6,785.

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, 29 January 2026.

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

Yes – the average flight time is 7 hours and 27 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 January, the average temperature is usually around 4°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, TAP Air Portugal and British Airways offer the cheapest flight tickets to London.

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

Expect to be travelling for 8 hours 20 minutes. That's the average journey time for a direct flight from Washington Dulles International Airport to London.
Washington Dulles International Airport is located in Washington DC. Following the UTC+0 timezone, London is four hours ahead of Washington DC.
The most popular route is from Washington Dulles International Airport (IAD) to London Heathrow Airport (LHR). You can choose from 39 services every week between these two airports. If you'd like to get on your way as soon as possible, the earliest flight from IAD to LHR is the 17:40 British Airways option. If you prefer to leave later in the day, the final departure is at 23:50 with United Airlines.
For a stress-free journey, turn up at the airport two hours ahead of international flights and one hour before domestic departures. This leaves you with plenty of time to board your IAD to London flight.
Heading off during a peak period like a bank holiday? Expect longer lines at security and check-in. To be on the safe side, arrive up to four hours before international flights and two hours before domestic departures.
You can book a direct Washington Dulles International Airport to London ticket. Start your journey at IAD and touch down at London Heathrow Airport (LHR).
You'll have your pick of carriers offering direct flights from Washington Dulles International Airport to London. Get on board with any of these:
Think about adding a stopover to potentially unlock a cheaper flight ticket from IAD to London. Simply deselect 'Direct flights only' during your search. Take a detour (and maybe pocket some savings) by stopping at one of these connecting airports:
- Amsterdam Airport Schiphol (AMS)
- John F. Kennedy International Airport (JFK)
- Charles de Gaulle Airport (CDG)
Travelling from central Washington DC to IAD takes about 1 hour 10 minutes on public transport. If you drive, ride-share or get a cab, you'll cover the 40 kilometres in 50 minutes or so, depending on traffic.
Booked an early flight from Washington Dulles International Airport to London? Avoid the last-minute rush to the airport (and catch some extra z's) by choosing one of these hotels close to IAD:
When it comes to Washington Dulles International Airport's on-time performance, data shows 74.39% of flights arrive within the expected time frame.
IAD is located at 1 Saarinen Circle.

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

R 3,032 is the cheapest price we've found for a one-way Washington Dulles International Airport to London flight. A round-trip flight ticket right now is R 6,785. Depending on when you want to go and the availability, these fares can change.
To score cheap flights from IAD to London, book your trip three months ahead of your planned departure.
July is the best month for landing an awesome deal on Washington Dulles International Airport to London tickets. If you want to travel during a different time of year, the 'Whole month' tool will show you the lowest prices for each month.
Save time searching for cheap flights from IAD to London by setting up a Price Alert. We'll send you an email or notification on the app when fares go down.
Choose your preferred departure and arrival times, airlines and number of stops with our filters. Then, sort the results for your flight from Washington Dulles International Airport to London by 'Cheapest,' 'Best' or 'Fastest.'

Airports in London

London Heathrow Airport (LHR)

London Heathrow Airport (LHR) to the centre of London takes around 55 minutes to reach by car. The centre is roughly 31 kilometres away.
It'll take around 1 hour to get there by public transport.
Consider staying in a hotel near LHR if you're coming in on a late flight from Washington Dulles International Airport to London. Pick one of these accommodation options and make your arrival easier:
Pick up a London Heathrow Airport rental car and explore London and beyond with your own set of wheels. Surprice, U-Save and Green Motion are top outlets to choose from here.
For the lowest price, reserve your vehicle from London Heathrow Airport about one week ahead of your flight from IAD to London.

London Gatwick Airport (LGW)

The centre of London is about 80 kilometres from London Gatwick Airport (LGW). Once your flight from Washington Dulles International Airport to London has touched down and you've made your way to arrivals, the drive should be around 1 hour 20 minutes.
The journey will take roughly 30 minutes on public transport.
Place the 'Do not disturb' sign on your door and relax at a hotel near LGW. Here are a few options where you can check in after your IAD to London flight:
Forget about inconvenient public transport schedules or cab lines. Pick up a London Gatwick Airport rental car and let the journey unfold your way. Check out the availability and rates from Green Motion, U-Save and Drivalia.
Get what you want, not just what's left over. Securing your ride from LGW three weeks in advance often means better deals and a wider choice of vehicles.

Stansted Airport (STN)

Step off your flight from Washington Dulles International Airport to London and go straight to your hotel or start discovering the city right away. Central London is around 64 kilometres from Stansted Airport (STN) and usually takes 1 hour to reach driving.
If you use public transport, the journey takes about 1 hour 25 minutes.
If you don't want to make your way into the centre, find a hotel near STN. Settle in at one of these stays after your IAD to London flight:
Begin your travels without stressing about how to reach your destination with a Stansted Airport rental car. You can book with reliable names here like Green Motion, Drivalia and Europcar.
If you're searching for a specific type of vehicle, lock in your ride from STN about 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

Before scheduling your flights from Washington Dulles International Airport to London, consider which time of year is best for you. Peak season in London offers a lively atmosphere and plenty to do, while the off-season brings better deals on hotels and fewer crowds.
Book a Washington Dulles International Airport to London flight ticket with a departure in July if you want to experience 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 like travelling in cooler conditions.

More about London

After booking your flight from Washington Dulles International Airport to London, find a hotel that offers the right mix of comfort and location. Make one of these options your base for exploring London:
The British Museum and Big Ben are just the start of the popular attractions to add to your London must-do list. Keep the momentum going by heading to Buckingham Palace.

Explore more of United Kingdom

London has plenty going for it, but there are so many other corners of United Kingdom just waiting to be discovered. Around 161 kilometres north-west of London, a trip to Birmingham will keep your itinerary packed. Don't miss top attractions like Cadbury World, The Library of Birmingham and National Sea Life Centre.
Around 177 kilometres west of London, Bristol is another essential stop in United Kingdom. Experience this destination's highlights firsthand at Clifton Suspension Bridge, Cabot Tower and Brandon Hill Nature Park.