$559 Cheap United flights Washington (IAD) to London (LHR)

View $559 flight on Tue, Jul 14, 2026Opens in a new window

$559 Cheap United flights Washington (IAD) to London (LHR)

Prices were available within the past 7 days and start at $559 for one-way flights and $849 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Tue, Sep 22 - Fri, Oct 2
IAD
Washington
LHR
London
$849 Roundtrip, found 7 hours ago
$849
Roundtrip
found 7 hours ago
Select United flight, departing Tue, Sep 22 from Washington to London, returning Fri, Oct 2, priced at $849 found 7 hours ago
United
Sun, Sep 20 - Fri, Oct 2
IAD
Washington
LHR
London
$852 Roundtrip, found 4 days ago
$852
Roundtrip
found 4 days ago
Select United flight, departing Sun, Sep 20 from Washington to London, returning Fri, Oct 2, priced at $852 found 4 days ago
United
Tue, Jul 14 - Mon, Sep 14
IAD
Washington
LHR
London
$903 Roundtrip, found 1 day ago
$903
Roundtrip
found 1 day ago
Select United flight, departing Tue, Jul 14 from Washington to London, returning Mon, Sep 14, priced at $903 found 1 day ago
United
Thu, Oct 8 - Tue, Oct 13
IAD
Washington
LHR
London
$903 Roundtrip, found 6 days ago
$903
Roundtrip
found 6 days ago
Select United flight, departing Thu, Oct 8 from Washington to London, returning Tue, Oct 13, priced at $903 found 6 days ago
United
Fri, Sep 25 - Sun, Oct 4
IAD
Washington
LHR
London
$949 Roundtrip, found 7 hours ago
$949
Roundtrip
found 7 hours ago
Select United flight, departing Fri, Sep 25 from Washington to London, returning Sun, Oct 4, priced at $949 found 7 hours ago
United
Fri, Sep 25 - Sun, Oct 4
IAD
Washington
LHR
London
$953 Roundtrip, found 7 hours ago
$953
Roundtrip
found 7 hours ago
Select United flight, departing Fri, Sep 25 from Washington to London, returning Sun, Oct 4, priced at $953 found 7 hours ago
United
Fri, Sep 25 - Sun, Oct 4
IAD
Washington
LHR
London
$961 Roundtrip, found 7 hours ago
$961
Roundtrip
found 7 hours ago
Select United flight, departing Fri, Sep 25 from Washington to London, returning Sun, Oct 4, priced at $961 found 7 hours ago
United
Fri, Sep 25 - Sun, Oct 4
IAD
Washington
LHR
London
$965 Roundtrip, found 7 hours ago
$965
Roundtrip
found 7 hours ago
Select United flight, departing Fri, Sep 25 from Washington to London, returning Sun, Oct 4, priced at $965 found 7 hours ago

Alternative airports near London

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Heathrow LHR. Cheapest option available. Average driving time to city center is 28 minutes. Flights from $1,197
LHR
Heathrow
Cheapest
Average driving time to city center28 min
Flights from $1,197

Find the cheapest month to fly from Washington (IAD) to London (LHR)

April is typically the cheapest month to fly

From $700 - $1,270 per traveler.

Travel information

Origin airport
Washington Dulles Intl.
Destination airport
Heathrow
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
British Airways
Distance
5866 km
Average flight time
12 hours 29 mins

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