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

Generally, when trying to get a below average price for your ticket, try to book around 1 days before departure. For the cheapest possible price, our data suggests booking 27 days before departure.

Is United Airlines the cheapest airline to fly with from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

With an average price of $825 return, United Airlines is not the cheapest airline to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport with. Instead, for the lowest price, our data suggests flying with PLAY, where a return flight costs $558 on average.

Does United Airlines fly direct to London Heathrow Airport from Washington, D.C. Dulles Intl Airport?

Yes, United Airlines does offer direct flights for the route, with around 6 flights per week.

$389 Cheap United Airlines Flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

IAD - LHR

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Cheap United Airlines Flight Deals from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

Here are some of the best deals found on KAYAK recently from United Airlines for round-trip flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Direct

Recent round-trip United Airlines flight deals from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

Mon, Aug 11 - Fri, Aug 22

6:35 pm - 6:55 amIAD-LHR

7h 20mnonstop

8:40 am - 4:15 pmLHR-IAD

12h 35m1 stop

$615United Airlines

Find Deal

Wed, Sep 24 - Mon, Sep 29

10:25 pm - 10:40 amIAD-LHR

7h 15mnonstop

1:45 pm - 4:15 pmLHR-IAD

31h 30m1 stop

$616United Airlines

Find Deal

Wed, Sep 10 - Wed, Sep 24

10:25 pm - 10:40 amIAD-LHR

7h 15mnonstop

9:30 am - 3:50 pmLHR-IAD

11h 20m1 stop

$620United Airlines

Find Deal

Wed, Oct 1 - Tue, Oct 14

9:45 am - 6:30 amIAD-LHR

15h 45m1 stop

8:30 am - 3:50 pmLHR-IAD

12h 20m1 stop

$621United Airlines

Find Deal

Sun, Aug 10 - Wed, Aug 20

5:31 pm - 10:00 amIAD-LHR

11h 29m1 stop

6:50 am - 1:30 pmLHR-IAD

11h 40m1 stop

$622United Airlines

Find Deal

Mon, Sep 1 - Fri, Oct 24

6:20 am - 8:40 pmIAD-LHR

9h 20m1 stop

6:30 am - 3:15 pmLHR-IAD

13h 45m1 stop

$625United Airlines

Find Deal

Wed, Aug 13 - Thu, Aug 21

6:15 am - 8:40 pmIAD-LHR

9h 25m1 stop

6:50 am - 1:30 pmLHR-IAD

11h 40m1 stop

$627United Airlines

Find Deal

Sun, Aug 24 - Wed, Oct 8

2:25 pm - 6:35 amIAD-LHR

11h 10m1 stop

7:45 am - 2:25 pmLHR-IAD

11h 40m1 stop

$629United Airlines

Find Deal

Sun, Aug 10 - Tue, Aug 19

6:35 pm - 6:55 amIAD-LHR

7h 20mnonstop

4:40 pm - 8:00 pmLHR-IAD

8h 20mnonstop

$634United Airlines

Find Deal

Mon, Aug 18 - Mon, Aug 25

6:35 pm - 6:55 amIAD-LHR

7h 20mnonstop

1:30 pm - 3:50 pmLHR-IAD

31h 20m1 stop

$639United Airlines

Find Deal

Useful Info

Low season	February
High season	July
Cheapest flight	$389
Average price round-trip	$808

Best time to beat the crowds with an average 12% drop in price.

Most popular time to fly with an average 15% increase in price.

Flight from Washington Dulles Airport to London Heathrow Airport

(price for this month)

When to Book Flights with United Airlines from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

Average price per month

Flight prices as travel date approaches

How far in advance should I book tickets for a flight with United Airlines from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
Generally, when trying to get a below average price for your ticket, try to book around 1 days before departure. For the cheapest possible price, our data suggests booking 27 days before departure.
Is United Airlines the cheapest airline to fly with from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
With an average price of $825 return, United Airlines is not the cheapest airline to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport with. Instead, for the lowest price, our data suggests flying with PLAY, where a return flight costs $558 on average.
What is the cheapest United Airlines flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
In the last 3 days, the lowest price for a flight with United Airlines from Washington, D.C. Dulles Intl Airport to London Heathrow Airport was $543 for a return flight and $384 for a one-way flight.
Does United Airlines fly direct to London Heathrow Airport from Washington, D.C. Dulles Intl Airport?
Yes, United Airlines does offer direct flights for the route, with around 6 flights per week.
What’s the cheapest day of the week to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport with United Airlines?
On average, the cheapest day of the week to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport with United Airlines is Saturday, when prices are around $378. The most expensive day is generally Friday, where the average price is around $493.
What’s the cheapest month to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport with United Airlines?
The cheapest month for United Airlines flights to London Heathrow Airport from Washington, D.C. Dulles Intl Airport is generally April, where plane tickets cost $462 on average. If possible, try to avoid the most expensive months of July and June, where tickets cost $533 and $763 respectively.

7.4

GoodBased on 8,744 verified guest reviews

7.3Comfort

6.6Food

7.0Entertainment

8.1Crew

7.7Boarding

Pros +

Cons -

Show reviews that mention

6.0 Okay

michael, May 2025

HNL-SFO

United out of SFO is having issues with catering so none of our meals were loaded on the plane and no offer of compensation for our tickets purchased was offered.

6.0 Okay

Lawrence, May 2025

SFO-HNL

Boarding seemed to be organized bedlam. For what ever reason, preboarding took longer than 20 minutes. Made the plane 20 minutes late taking off. Luckily we arrived on time. Flight crew seemed very friendly. Only slight turbulence.

10.0 Wonderful

Verified traveler, May 2025

IAD-HND

Overall, very good crew , pilot, flight

8.0 Very good

Verified traveler, May 2025

RDU-IAD

Turbulent taking off & landing to Dulles from Raleigh. Flight from Dulles to Tokyo very good!!

10.0 Wonderful

Verified traveler, May 2025

MEX-SFO

Its good expeince but in enternteiment please be like you tube the music i like or movie

6.0 Okay

Verified traveler, May 2025

ORD-YUL

Delay and keep changing gates. I have to run around from B to C then to E.

8.0 Very good

Verified traveler, May 2025

SFO-IAH

They had no food on any of the flights

6.0 Okay

Dorothy, May 2025

IAD-CDG

I fly UAL 7-8 times per year. This flight was not up to snuff because it boarded very late "due to unexpected delays in restocking the plane" and yet Flight Aware showed the plane had landed some 10 hours earlier--so I think they could have planned accordingly. The FA's were nice but harried. The video system had to be rebooted 3-4 times. The food service was rather abrupt; they forgot my row and when I asked for my meal, they brought it with some impatience. Overall, the flight was fine, but the little details made it feel somewhat mundane and hurried.

2.0 Poor

Craig, May 2025

SFO-CDG

They hired a new catering company the same day of my flight. They botched the job by not delivering the right carts and after THREE HOURS waiting, the flight crew timed out (flight was 19 hours long and FAA rules state crew can’t work more than 14 hours long). So they CANCELED OUR FLIGHT!! Worst experience ever. Avoid UAL at all costs.

6.0 Okay

Andrea, May 2025

ORD-ATL

I was charged for my daughters bag when I am supposed to receive two free checked bags with my United Explorer card.

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

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IAD - LHR

$389 Find Cheap United Airlines Flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

Search hundreds of travel sites at once for deals on United Airlines flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

Cheap United Airlines Flight Deals from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

Recent round-trip United Airlines flight deals from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

Recent one-way United Airlines flight deals from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

Recent last minute United Airlines flight deals from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

Recent direct United Airlines flight deals from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

Good to know

When to Book Flights with United Airlines from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

FAQs for flying to London Heathrow Airport with United Airlines

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

Is United Airlines the cheapest airline to fly with from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

What is the cheapest United Airlines flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Does United Airlines fly direct to London Heathrow Airport from Washington, D.C. Dulles Intl Airport?

What’s the cheapest day of the week to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport with United Airlines?

What’s the cheapest month to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport with United Airlines?

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

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Cabin classes available on flights to Washington, D.C. Dulles Intl Airport. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.

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The most popular flights on KAYAK according to clicks in the last 2 weeks. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.

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