$617 Cheap United flights Philadelphia (PHL) to London (LHR)

View $617 flight on Wed, May 20, 2026Opens in a new window

$617 Cheap United flights Philadelphia (PHL) to London (LHR)

Prices were available within the past 7 days and start at $617 for one-way flights and $719 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, Mar 25 - Tue, Mar 31
PHL
Philadelphia
LHR
London
$719 Roundtrip, found 3 days ago
$719
Roundtrip
found 3 days ago
Select United flight, departing Wed, Mar 25 from Philadelphia to London, returning Tue, Mar 31, priced at $719 found 3 days ago
United
Wed, Mar 25 - Tue, Mar 31
PHL
Philadelphia
LHR
London
$724 Roundtrip, found 3 days ago
$724
Roundtrip
found 3 days ago
Select United flight, departing Wed, Mar 25 from Philadelphia to London, returning Tue, Mar 31, priced at $724 found 3 days ago

Find the cheapest month to fly from Philadelphia (PHL) to London (LHR)

October is typically the cheapest month to fly

From $477 - $830 per traveler.
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Flights from Philadelphia (PHL) to London (LHR)
Origin airport
Philadelphia Intl.
Destination airport
Heathrow
Airlines serving
Aer Lingus, Air Canada, Air France, American Airlines, British Airways, Delta, Finnair, Iberia, JetBlue Airways, KLM, Lufthansa, Scandinavian Airlines, United, Virgin Atlantic
Popular airline
British Airways
Distance
5656 km