Cheap Flights From Washington Dulles Intl. (IAD) To Heathrow (LHR)

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Cheapest Flights from Washington (IAD) to London (LHR)

The cheapest flights to Heathrow found within the past 7 days were CA $619 round trip and CA $484 one way. Prices and availability subject to change. Additional terms may apply.

Wed, Feb 25 - Wed, Mar 4
IAD
Washington
LHR
London
CA $619 Roundtrip, found 3 hours ago
CA $619
Roundtrip
found 3 hours ago
Select TAP Portugal flight, departing Wed, Feb 25 from Washington to London, returning Wed, Mar 4, priced at CA $619 found 3 hours ago
Wed, Feb 25 - Wed, Mar 4
IAD
Washington
LHR
London
CA $629 Roundtrip, found 3 hours ago
CA $629
Roundtrip
found 3 hours ago
Select TAP Portugal flight, departing Wed, Feb 25 from Washington to London, returning Wed, Mar 4, priced at CA $629 found 3 hours ago
Wed, Feb 25 - Wed, Mar 4
IAD
Washington
LHR
London
CA $639 Roundtrip, found 3 hours ago
CA $639
Roundtrip
found 3 hours ago
Select TAP Portugal flight, departing Wed, Feb 25 from Washington to London, returning Wed, Mar 4, priced at CA $639 found 3 hours ago
Tue, Feb 17 - Tue, Mar 10
IAD
Washington
LHR
London
CA $734 Roundtrip, found 9 hours ago
CA $734
Roundtrip
found 9 hours ago
Select TAP Portugal flight, departing Tue, Feb 17 from Washington to London, returning Tue, Mar 10, priced at CA $734 found 9 hours ago
Wed, Feb 25 - Wed, Mar 4
IAD
Washington
LHR
London
CA $749 Roundtrip, found 3 hours ago
CA $749
Roundtrip
found 3 hours ago
Select Icelandair flight, departing Wed, Feb 25 from Washington to London, returning Wed, Mar 4, priced at CA $749 found 3 hours ago
Wed, Feb 25 - Wed, Mar 4
IAD
Washington
LHR
London
CA $794 Roundtrip, found 3 hours ago
CA $794
Roundtrip
found 3 hours ago
Select Scandinavian Airlines flight, departing Wed, Feb 25 from Washington to London, returning Wed, Mar 4, priced at CA $794 found 3 hours ago
Wed, Feb 25 - Wed, Mar 4
IAD
Washington
LHR
London
CA $848 Roundtrip, found 3 hours ago
CA $848
Roundtrip
found 3 hours ago
Select Virgin Atlantic flight, departing Wed, Feb 25 from Washington to London, returning Wed, Mar 4, priced at CA $848 found 3 hours ago
Tue, Jan 27 - Tue, Feb 3
IAD
Washington
LHR
London
CA $849 Roundtrip, found 3 days ago
CA $849
Roundtrip
found 3 days ago
Select Aer Lingus flight, departing Tue, Jan 27 from Washington to London, returning Tue, Feb 3, priced at CA $849 found 3 days ago
Wed, Jan 7 - Wed, Jan 14
IAD
Washington
LHR
London
CA $855 Roundtrip, found 4 days ago
CA $855
Roundtrip
found 4 days ago
Select Brussels Airlines flight, departing Wed, Jan 7 from Washington to London, returning Wed, Jan 14, priced at CA $855 found 4 days ago
Wed, Feb 25 - Wed, Mar 4
IAD
Washington
LHR
London
CA $859 Roundtrip, found 3 hours ago
CA $859
Roundtrip
found 3 hours ago
Select Swiss International Air Lines flight, departing Wed, Feb 25 from Washington to London, returning Wed, Mar 4, priced at CA $859 found 3 hours ago

Frequently asked questions

Are there direct flights from Washington Dulles Intl. Airport (IAD) to LHR?
Kick off your escape relaxed and calm and travel straight to Heathrow Airport from IAD. United Airlines and British Airways are among the airlines that offer nonstop services on this flight path.
What airlines fly from IAD to Heathrow Airport (LHR)?
If you're flying to London from Sterling, you'll find several airlines that advertise direct flights. One of the best is United Airlines (UA), which has 60 flights each month. If you want more options, check out the fares on offer from British Airways (BA). This airline operates 60 flights on the Sterling to London route each month. Between the two, you're bound to find the flight that's perfect for you.
What is the best day to buy a plane ticket?
Airfares offered on Friday tend to be the cheapest, according to flight demand on Travelocity.ca in 2021. Purchasing your airfares on a Thursday or Saturday can also provide better value, however our advice if you're looking to save money is to avoid booking on a Wednesday or Sunday. Our data shows that those two days have the highest ticket values on average, so keep this in mind if you're browsing flight deals.
What are the cheapest days to fly?
Frequent travellers may already know this, but earlier in the week is often the cheapest time to fly. Flights departing on a Monday are the cheapest of the week. Since flights towards the middle of the week tend to be more popular, this causes the prices to rise. This is why, on average, airfares booked on Travelocity.ca in 2021 were most expensive for Wednesday departures.
How far in advance can you book a flight?
Here's the deal: It is typically possible to start comparing international airfares on Travelocity.ca up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 2-4 weeks prior to their travel dates.*According to flight demand on Travelocity.ca from January to December 2021. Savings are subject to change and may vary depending on selections made.

Popular Flight Routes from Washington (IAD)

Travelers at IAD love to visit these top cities. Roam to the top destinations from Washington (IAD) today with the cheap prices from Travelocity!

Popular Flight Routes from London (LHR)

Travelers at LHR love to visit these top cities. Roam to the top destinations from London(LHR) today with the cheap prices from Travelocity!

*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.