$1,594 Cheap United flights London (LHR) to Washington (IAD)

View $1,594 flight on Sat, Sep 27, 2025Opens in a new window

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$1,594 Cheap United flights London (LHR) to Washington (IAD)

Prices were available within the past 7 days and start at $1,594 for one-way flights and $593 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sun, Nov 16 - Wed, Nov 19
LHR
London
IAD
Washington
$593 Roundtrip, found 1 day ago
$593
Roundtrip
found 1 day ago
Select United flight, departing Sun, Nov 16 from London to Washington, returning Wed, Nov 19, priced at $593 found 1 day ago
Flights from London (LHR) to Washington (IAD)
Origin airport
Heathrow
Destination airport
Washington Dulles Intl.
Airlines serving
Aer Lingus, Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, Icelandair, KLM, Lufthansa, Royal Air Maroc, Scandinavian Airlines, Swiss International Air Lines, TAP Portugal, Turkish Airlines, United, Virgin Atlantic
Popular airline
Aer Lingus
Distance
3666 mi
Average flight time
3 hours 14 mins

Frequently asked questions

How much is a United Airlines flight from Heathrow Airport (LHR) to Washington Dulles Intl. Airport (IAD)?
You'll discover affordable round-trip United Airlines flights from $593 from LHR to IAD by filtering your results from "Price (lowest to highest)" on Expedia. Or search for deals from $1,594 for a one-way journey.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from LHR to IAD with United Airlines?
January is one of the most affordable months to fly to Washington with United Airlines. You could also find excellent prices on return and one-way fares in February.
What is the cheapest time to book flights from Heathrow Airport (LHR) to Washington Dulles Intl. Airport (IAD) with United Airlines?
To get affordable flights from LHR to IAD with United Airlines, start your search about one month before your planned departure. You can save 17% when you book your international tickets 18 to 29 days ahead instead of booking four to five months in advance. Another tip? Booking on Sunday can lead to average savings of 17% compared to Friday (the most expensive day).**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does United Airlines fly nonstop from Heathrow Airport (LHR) to Washington Dulles Intl. Airport (IAD)?
United Airlines offers direct flights from Heathrow Airport (LHR) to Washington Dulles Intl. Airport (IAD), with 14 departures every week. Simply select the "Nonstop" and "Airline" filters while searching on Expedia to find all direct United Airlines flights to IAD.
How long does it take to fly from LHR to IAD with United Airlines?
Depart Heathrow Airport (LHR) for Washington Dulles Intl. Airport (IAD) on a nonstop United Airlines flight, and you'll be in the sky for approximately 8h 45m.
Which day of the week has the most United Airlines flights from Heathrow Airport (LHR) to Washington Dulles Intl. Airport (IAD)?
United Airlines has the most flights from Heathrow Airport (LHR) to Washington Dulles Intl. Airport (IAD) on Wednesday. With up to 2 daily departures, you'll get the most options and flexibility on this day.
What is the earliest United Airlines flight from LHR to IAD?
The earliest United Airlines flight from LHR to IAD takes off at 12:05PM UTC+0, landing at 3:40PM UTC-5. If you want to set off later in the day, the last United Airlines flight leaves LHR at 4:20PM UTC+0 and lands at IAD at 8:15PM UTC-5. Flying early is often a smart option as morning and mid-morning flights are least likely to experience cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports does United Airlines fly into in Washington?
United Airlines flights from Heathrow Airport (LHR) to Washington arrive at Washington Dulles Intl. Airport (IAD) and Baltimore Washington Intl. Thurgood Marshall Airport (BWI). The main Washington gateway served by this airline is IAD. It's worth checking out flights arriving at nearby airports on Expedia as they may have lower prices.
Why fly with United Airlines from LHR to IAD?
A rewarding loyalty program and the ability to collect points through United Mileage Plus are the start of the reasons to depart from LHR to IAD with United Airlines. Plus, when you sign up to our One Key™ program, you can receive OneKeyCash™* alongside United Airlines's loyalty program earnings. It's yours to spend on your next adventure.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
What type of plane does United Airlines fly from Heathrow Airport (LHR) to Washington Dulles Intl. Airport (IAD)?
For the Heathrow Airport (LHR) to Washington Dulles Intl. Airport (IAD) route, United Airlines typically uses Boeing 767-300 and Boeing 777 planes. Don't forget that last-minute changes can occur for operational demands, so your flight could be on another aircraft.
Can I change or cancel my United Airlines flight from Heathrow Airport (LHR) to Washington Dulles Intl. Airport (IAD)?
Changes are usually free within 24 hours of making your booking, but your airline may charge you after that. For further details about modifying your reservation, head to your "Trips," select your flight and click on "Manage Booking." If you want the freedom to change your plans without extra charges, tick the "No cancel fee" or "Changes included" filter when organizing your next getaway.

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