Title: £686 Cheap United flights from London to Philadelphia (LHR→PHL) - Expedia.co.uk ![Street view of downtown Philadelphia in PA, USA](https://images.trvl-media.com/place/178297/8334056d-4758-4753-ae85-5adcad811308.jpg?impolicy=fcrop&w=1200&h=500&q=medium) ![](https://images.trvl-media.com/place/178297/8334056d-4758-4753-ae85-5adcad811308.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # £686 Cheap United flights from London to Philadelphia (LHR→PHL) [View £686 flight on Tue, 27 Jan 2026](https://expedia.co.uk/Flights-Search?trip=oneway&leg1=from:LHR,to:PHL,departure:27/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:685.92&airProductToken=AQpsCjQI1YIBEgM5MTkY64kBIIgYKPXGgwMw88qDAzhVQABYAWoIRUNPQkFTSUNyCFVMWE1TT0JRCjQI1YIBEgQ0NTcwGIgYIO9ZKPDLgwMwusyDAzhVQAFYAWoIRUNPQkFTSUNyCFVMWE1TT0JREgoIARABGAEqAlVBGAEiBAgBEAEoAigDKAQwAQ) - [Return](?flightType=roundtrip) - [One-way](?flightType=oneway) - [Multi-city](?flightType=multicity) ### Travellers Adults ChildrenAges 2 to 17 InfantsYounger than 2 EconomyPremium economyBusiness classFirst class Leaving from Going to Departing Returning Add a place to stay Add a car Direct flights only ![notification illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__notification.svg) ### Be in the know Get alerts if flight prices drop or rise\* ![deals illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__deals.svg) ### Book smarter Save up to 25% on select hotels after you book a flight\* ![trophy illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__trophy.svg) ### Earn twice Earn your airline miles on top of our rewards [Sign in](https://www.expedia.co.uk/login) ## United flights from London to Philadelphia (LHR→PHL) Prices were available within the past 7 days and start at £686 for one-way flights and £452 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. All deals One way Return ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Sat, 22 Nov - Sat, 6 Dec LHR London PHL Philadelphia £452 Return found 21 hours ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:LHR,to:PHL,departure:22/11/2025TANYT&leg2=from:PHL,to:LHR,departure:06/12/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:451.92&airProductToken=AQptCjUI1YIBEgQ4ODEwGOuJASClBCia3_0CMPnf_QI4S0AAWAFqCEVDT0JBU0lDcghLTFBPNUZCUQo0CNWCARIEOTY1OBilBCDvWSjO4P0CMO_k_QI4S0ABWAFqCEVDT0JBU0lDcghLTFBPNUZCUQpsCjQI1YIBEgQ0NTMwGO9ZIIgYKIGE_wIwx4T_AjhLQABYAWoIRUNPQkFTSUNyCEtMUE81RkJRCjQI1YIBEgM5MjQYiBgg64kBKIOF_wIwyoj_AjhLQAFYAWoIRUNPQkFTSUNyCEtMUE81RkJREgoIARABGAEqAlVBGAEiBAgBEAEoAigDKAQwAQ) Flight from London to Philadelphia route information | Origin airport | Heathrow | | --- | --- | | Destination airport | Philadelphia Intl. | | Airlines serving | Aer Lingus, Air Canada, Air France, American Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, Icelandair, JetBlue Airways, KLM, Lufthansa, Scandinavian Airlines, Swiss International Air Lines, TAP Portugal, United, Virgin Atlantic | | Popular airline | Aer Lingus | | Distance | 5656 km | | Average flight time | 2 hours 58 mins | - 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