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 $633 round trip and CA $492 one way. Prices and availability subject to change. Additional terms may apply.

Wed, Jan 21 - Mon, Jan 26
IAD
Washington
LHR
London
CA $633 Roundtrip, found 1 day ago
CA $633
Roundtrip
found 1 day ago
Select TAP Portugal flight, departing Wed, Jan 21 from Washington to London, returning Mon, Jan 26, priced at CA $633 found 1 day ago
Wed, Feb 4 - Sun, Feb 8
IAD
Washington
LHR
London
CA $633 Roundtrip, found 19 hours ago
CA $633
Roundtrip
found 19 hours ago
Select TAP Portugal flight, departing Wed, Feb 4 from Washington to London, returning Sun, Feb 8, priced at CA $633 found 19 hours ago
Wed, Jan 21 - Mon, Jan 26
IAD
Washington
LHR
London
CA $643 Roundtrip, found 1 day ago
CA $643
Roundtrip
found 1 day ago
Select TAP Portugal flight, departing Wed, Jan 21 from Washington to London, returning Mon, Jan 26, priced at CA $643 found 1 day ago
Wed, Feb 4 - Sun, Feb 8
IAD
Washington
LHR
London
CA $653 Roundtrip, found 19 hours ago
CA $653
Roundtrip
found 19 hours ago
Select TAP Portugal flight, departing Wed, Feb 4 from Washington to London, returning Sun, Feb 8, priced at CA $653 found 19 hours ago
Wed, Jan 21 - Mon, Jan 26
IAD
Washington
LHR
London
CA $727 Roundtrip, found 1 day ago
CA $727
Roundtrip
found 1 day ago
Select Icelandair flight, departing Wed, Jan 21 from Washington to London, returning Mon, Jan 26, priced at CA $727 found 1 day ago
Wed, Jan 21 - Mon, Jan 26
IAD
Washington
LHR
London
CA $739 Roundtrip, found 1 day ago
CA $739
Roundtrip
found 1 day ago
Select Scandinavian Airlines flight, departing Wed, Jan 21 from Washington to London, returning Mon, Jan 26, priced at CA $739 found 1 day ago
Sun, Dec 7 - Tue, Dec 16
IAD
Washington
LHR
London
CA $780 Roundtrip, found 18 hours ago
CA $780
Roundtrip
found 18 hours ago
Select Aer Lingus flight, departing Sun, Dec 7 from Washington to London, returning Tue, Dec 16, priced at CA $780 found 18 hours ago
Sun, Dec 7 - Tue, Dec 16
IAD
Washington
LHR
London
CA $818 Roundtrip, found 18 hours ago
CA $818
Roundtrip
found 18 hours ago
Select Virgin Atlantic flight, departing Sun, Dec 7 from Washington to London, returning Tue, Dec 16, priced at CA $818 found 18 hours ago
Sat, Oct 17 - Mon, Oct 26
IAD
Washington
LHR
London
CA $839 Roundtrip, found 3 hours ago
CA $839
Roundtrip
found 3 hours ago
Select Austrian Airlines flight, departing Sat, Oct 17 from Washington to London, returning Mon, Oct 26, priced at CA $839 found 3 hours ago
Mon, Sep 14 - Wed, Sep 23
IAD
Washington
LHR
London
CA $851 Roundtrip, found 4 days ago
CA $851
Roundtrip
found 4 days ago
Select British Airways flight, departing Mon, Sep 14 from Washington to London, returning Wed, Sep 23, priced at CA $851 found 4 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.