£211 Cheap Flights from Washington (IAD) to London (LHR)

You can find one-way and return flights from Washington, DC (IAD) to London (LHR) with Expedia. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see our cheapest fares first, and use the Price Tracking tool to receive alerts when IAD to LHR ticket fares go up or down.

February is typically the cheapest month to fly from Washington Dulles Intl. (IAD) to London Heathrow (LHR), with average return fares around £490. February often sees lower prices because it falls after the busy holiday season, when travel demand tends to decrease, leading airlines to offer more competitive fares. Other cheap months to fly from Washington Dulles Intl. (IAD) to London Heathrow (LHR) include September and October.

You have 3 airlines offering direct flights from Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow). Here are the carriers:

* British Airways operates 22 direct flights from Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow) every week.
* United operates 14 direct flights from Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow) every week.
* Virgin Atlantic operates 7 direct flights from Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow) every week.

To find a cheap flight from Washington, DC (IAD) to London (LHR), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.

The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.

The earliest flight from Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow) typically departs around 5:00 AM. This service is operated by American Airlines. This is a seasonal service, active in February and March. An early departure like this can help you make the most of your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.

A non-stop flight from Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow) typically takes around 7 hours 30 minutes. This route covers a distance of approximately 5,901 kilometers. If you opt for a flight with one stop, your journey will usually be longer, taking about 12 hours 48 minutes. Flights with two or more stops will extend your travel time even further, to around 15 hours 30 minutes. Keep in mind that actual flight times can vary due to factors like wind patterns and specific routing.

Select the "Business class" and "First class" filters when looking for Washington, DC (IAD) to London (LHR) flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.

A direct, return business class ticket from Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow) typically costs between £7,309 - £12,063. Prices often fluctuate based on seasonality and how early you book. You may also be able to find a cheaper business class journey between Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow) if you opt for a connecting flight.

It's easy to earn miles on a Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.

*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.

If you're planning to travel to London from Washington Dulles Intl. (IAD), you can fly directly into Heathrow (LHR). Some flights may connect through major hubs like Dublin (DUB), Charlotte-Douglas Intl. (CLT), or Liberty Intl. (EWR) before reaching London. Compare routes and airports on Expedia to find the best flight options for your travel plans.

Typically, booking a last minute flight from Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.

Securing a Washington, DC (IAD-Washington Dulles Intl.) to London (LHR-Heathrow) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.

If you booked your Washington, DC (IAD) to London (LHR) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.