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

Wander Wisely with exceptional service, 24/7 supportOpens in a new window

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

Find The Best Dates To Fly

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

The cheapest flights to Heathrow found within the past 7 days were CA $617 round trip and CA $318 one way. Prices and availability subject to change. Additional terms may apply.

Thu, Oct. 2 - Tue, Oct. 7
IAD
Washington
LHR
London
CA $617 Roundtrip, found 5 days ago
CA $617
Roundtrip
found 5 days ago
Select TAP Portugal flight, departing Thu, Oct. 2 from Washington to London, returning Tue, Oct. 7, priced at CA $617 found 5 days ago
Thu, Jan. 22 - Wed, Jan. 28
IAD
Washington
LHR
London
CA $619 Roundtrip, found 3 days ago
CA $619
Roundtrip
found 3 days ago
Select TAP Portugal flight, departing Thu, Jan. 22 from Washington to London, returning Wed, Jan. 28, priced at CA $619 found 3 days ago
Thu, Jan. 22 - Wed, Jan. 28
IAD
Washington
LHR
London
CA $629 Roundtrip, found 3 days ago
CA $629
Roundtrip
found 3 days ago
Select TAP Portugal flight, departing Thu, Jan. 22 from Washington to London, returning Wed, Jan. 28, priced at CA $629 found 3 days ago
Sun, Aug. 17 - Tue, Aug. 26
IAD
Washington
LHR
London
CA $708 Roundtrip, found 5 days ago
CA $708
Roundtrip
found 5 days ago
Select Virgin Atlantic flight, departing Sun, Aug. 17 from Washington to London, returning Tue, Aug. 26, priced at CA $708 found 5 days ago
Sun, Aug. 17 - Tue, Aug. 26
IAD
Washington
LHR
London
CA $716 Roundtrip, found 5 days ago
CA $716
Roundtrip
found 5 days ago
Select Virgin Atlantic flight, departing Sun, Aug. 17 from Washington to London, returning Tue, Aug. 26, priced at CA $716 found 5 days ago
Wed, Aug. 20 - Mon, Sep. 1
IAD
Washington
LHR
London
CA $720 Roundtrip, found 5 days ago
CA $720
Roundtrip
found 5 days ago
Select Brussels Airlines flight, departing Wed, Aug. 20 from Washington to London, returning Mon, Sep. 1, priced at CA $720 found 5 days ago
Tue, Sep. 9 - Sun, Sep. 14
IAD
Washington
LHR
London
CA $736 Roundtrip, found 5 days ago
CA $736
Roundtrip
found 5 days ago
Select Icelandair flight, departing Tue, Sep. 9 from Washington to London, returning Sun, Sep. 14, priced at CA $736 found 5 days ago
Sun, Aug. 17 - Tue, Aug. 26
IAD
Washington
LHR
London
CA $798 Roundtrip, found 5 days ago
CA $798
Roundtrip
found 5 days ago
Select Air Canada flight, departing Sun, Aug. 17 from Washington to London, returning Tue, Aug. 26, priced at CA $798 found 5 days ago
Wed, Oct. 1 - Wed, Oct. 8
IAD
Washington
LHR
London
CA $830 Roundtrip, found 20 hours ago
CA $830
Roundtrip
found 20 hours ago
Select Aer Lingus flight, departing Wed, Oct. 1 from Washington to London, returning Wed, Oct. 8, priced at CA $830 found 20 hours ago
Tue, Sep. 9 - Sun, Sep. 14
IAD
Washington
LHR
London
CA $849 Roundtrip, found 5 days ago
CA $849
Roundtrip
found 5 days ago
Select Lufthansa flight, departing Tue, Sep. 9 from Washington to London, returning Sun, Sep. 14, priced at CA $849 found 5 days 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.