Question 1

What are the cheapest airlines flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport round-trip?

Accepted Answer

Currently priced at £400, Delta will fly you from Washington, D.C. Dulles Intl Airport to London Heathrow Airport and back. In addition to Delta, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from British Airways and Iberia - these airlines can fly you to your destination from £401 and £402, respectively. You may be able to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport for 29% less than the average price by searching for these airlines.

Question 2

How far ahead should I book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Accepted Answer

The price you pay for your flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport may vary depending on when you book. For the best chance of a lower fare, look to book 45 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

Question 3

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

Accepted Answer

Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport (average of £112). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in August is currently the most expensive (average of £164). 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.

Question 4

What is the cheapest day to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Accepted Answer

Travellers seeking maximum savings on their Washington, D.C. Dulles Intl Airport to London Heathrow Airport flight should consider departing on Monday evenings when fares are most often at their lowest. Saturday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Question 5

Weekly flight availability from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

Accepted Answer

The most flights from IAD to LHR are scheduled on a Wednesday (29 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (23 on average).

Question 6

E

Accepted Answer

In terms of precipitation, rainfall in London Heathrow Airport ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London Heathrow Airport when rainfall is around 40.0 mm.

Question 7

E

Accepted Answer

If weather is an important factor for your trip to London Heathrow 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 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

Question 8

What are the cheapest flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Accepted Answer

On average you can expect to pay £1,102 for a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport. The cheapest flight overall is £263 while the most popular route, (Washington, D.C. Dulles Intl - London Heathrow) is currently priced at £310.

Question 9

What are the most reliable airlines from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Accepted Answer

Before booking your flight to London Heathrow Airport from Washington, D.C. Dulles Intl Airport, check out the most reliable airlines to get you to your destination on time: KLM (68%), Air France (68%), Delta( 68%).

Question 10

What are the most popular airlines that fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Accepted Answer

Before booking your flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport check out the most popular airlines for this route: Air France, British Airways or Icelandair.

Question 11

What is the cheapest day to fly round-trip from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Accepted Answer

Tuesday is generally a great day to depart. Flying on this day could help you save up to 16%.

Question 12

How far in advance should I book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Accepted Answer

Find a great deal and save up to 37% by booking at least 48 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from Washington, D.C. Dulles Intl Airport to London Heathrow Airport within the next two weeks, with the cheapest ticket starting at £590.

Question 13

What is the cheapest month to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Accepted Answer

January is one of the best times of the year to fly to London Heathrow Airport from Washington, D.C. Dulles Intl Airport. Prices for January average £545 per person but you can even find prices for as low as £283. The most expensive prices can be found in the month of June. Opting for a January flight can save you 30% on your journey compared to booking in June

Question 14

What is the cheapest time of day to fly from IAD to LHR?

Accepted Answer

When flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport, the time of day you fly usually plays a role in the price. Save by searching for a flight at midday, which can drop the price by up to 6% versus a flight in the morning.

Question 15

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

Accepted Answer

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

Question 16

How can I find direct flights from Dulles Intl to Heathrow?

Accepted Answer

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

Question 17

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

Accepted Answer

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

Question 18

How does Cheapflights help users find flights from Dulles Intl to Heathrow?

Accepted Answer

Deals for Dulles Intl to Heathrow flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Question 19

Why should you use Cheapflights to find cheap flight tickets from Dulles Intl to Heathrow?

Accepted Answer

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Dulles Intl to Heathrow.

Question 20

Can Cheapflights find flights from Dulles Intl to Heathrow with no change fees?

Accepted Answer

Need flexible booking options for your flight to Heathrow from Dulles Intl? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Question 21

Can Cheapflights notify me if prices for flights from Dulles Intl to Heathrow become cheaper?

Accepted Answer

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

Round-trip from	£400
One-way from	£197
Popular in	June
Cheapest in	September
Average price	£656
Good round-trip deal	£451 or less
Good one-way deal	£299 or less

Airline	Cheapest	Average	Flexibility	On-time
Icelandair	Cheapest£365	Average£515	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
Air France	Cheapest£392	Average£534	FlexibilityNo cancel fee	On-time77%	Search Air France flights
Lufthansa	Cheapest£399	Average£745	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
Virgin Atlantic	Cheapest£429	Average£634	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
British Airways	Cheapest£442	Average£542	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Iberia	Cheapest£452	Average£506	FlexibilityNo cancel fee	On-time77%	Search Iberia flights
KLM	Cheapest£454	Average£544	FlexibilityNo cancel fee	On-time75%	Search KLM flights
United Airlines	Cheapest£481	Average£618	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights

Cheap flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport from £197

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/10. Fares are subject to change and may not be available on all flights or dates of travel.

Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to London Heathrow are usually found in September or October, booked 45 days in advance, depart on a Wednesday or Tuesday and return on a Wednesday

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Find flight deals from Dulles Intl to Heathrow

Cheapest flights from Dulles Intl to HeathrowExplore the most affordable flight options available from Dulles Intl to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 11 luglio 2025.

Explore the most affordable flight options available from Dulles Intl to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 11 luglio 2025.

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Best time to book a flight from Dulles Intl to Heathrow

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

How far ahead should I book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Use this chart to determine the optimal time to book a return flight from Dulles Intl to Heathrow. Price data was last updated on 27 June 2025.

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

What is the cheapest time of day to fly from IAD to LHR?

Find hourly flight availability from Dulles Intl to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 11 luglio 2025.

Weekly flight availability from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

Explore weekly flight availability from Dulles Intl to Heathrow. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 11 luglio 2025.

How much does it cost for a return flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Reviews of airlines servicing Heathrow

Related info for your journey

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

What are the cheapest airlines flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport round-trip?

What are the most reliable airlines from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

What are the cheapest flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

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

How can I find direct flights from Dulles Intl to Heathrow?

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

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

Travelling to a place near Washington, D.C. Dulles Intl Airport?

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Alternative routes for Dulles Intl to Heathrow

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Top 8 airlines flying from Dulles Intl to Heathrow

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Can Cheapflights find flights from Dulles Intl to Heathrow with no change fees?

Can Cheapflights notify me if prices for flights from Dulles Intl to Heathrow become cheaper?

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Cheapest flights from Dulles Intl to Heathrow
Explore the most affordable flight options available from Dulles Intl to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 11 luglio 2025.