Title: £212 Flights from Philadelphia to London Heathrow (PHL to LHR) - Expedia.co.uk ![](https://images.trvl-media.com/place/178279/2a1d5619-553b-468a-a773-e81b88024741.jpg?impolicy=fcrop&w=1200&h=500&q=medium) ![](https://images.trvl-media.com/place/178279/2a1d5619-553b-468a-a773-e81b88024741.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # £212 Cheap Flights from Philadelphia (PHL) to London (LHR) [View £212 flight on Sat, 6 Dec 2025](https://expedia.co.uk/Flights-Search?trip=oneway&leg1=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:211.40&airProductToken=AQpgCi0IwmwSAzc2MBjvWSDBkwEorIL_AjD-gv8COExAAFgBagJETnIIUEk5UUJPTDEKLwjCbBIEMTYyMBjBkwEg64kBKMyD_wIw34b_AjhMQAFYAWoCRE5yCFBMN0xTVkwxEgoIARABGAEqAkI2GAEiBAgBEAEoAigEKAYwAQ) - [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 ## Popular airlines from Philadelphia International Airport (PHL) to Heathrow Airport (LHR) - ![British Airways](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_BA.svg) British Airways [](https://www.expedia.co.uk/Flights-Search?leg1=from:phl,to:lhr,departure:16/10/2025TANYT&leg2=from:lhr,to:phl,departure:23/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"BA"}}]) - ![Aer Lingus](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_EI.svg) Aer Lingus [](https://www.expedia.co.uk/Flights-Search?leg1=from:phl,to:lhr,departure:16/10/2025TANYT&leg2=from:lhr,to:phl,departure:23/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"EI"}}]) - ![Air Canada](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AC.svg) Air Canada [](https://www.expedia.co.uk/Flights-Search?leg1=from:phl,to:lhr,departure:16/10/2025TANYT&leg2=from:lhr,to:phl,departure:23/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AC"}}]) - ![Iberia](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_IB.svg) Iberia [](https://www.expedia.co.uk/Flights-Search?leg1=from:phl,to:lhr,departure:16/10/2025TANYT&leg2=from:lhr,to:phl,departure:23/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"IB"}}]) - ![JetBlue Airways](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_B6.svg) JetBlue Airways [](https://www.expedia.co.uk/Flights-Search?leg1=from:phl,to:lhr,departure:16/10/2025TANYT&leg2=from:lhr,to:phl,departure:23/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"B6"}}]) - ![Finnair](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AY.svg) Finnair [](https://www.expedia.co.uk/Flights-Search?leg1=from:phl,to:lhr,departure:16/10/2025TANYT&leg2=from:lhr,to:phl,departure:23/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AY"}}]) - ![Virgin Atlantic](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_VS.svg) Virgin Atlantic [](https://www.expedia.co.uk/Flights-Search?leg1=from:phl,to:lhr,departure:16/10/2025TANYT&leg2=from:lhr,to:phl,departure:23/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"VS"}}]) ![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) ## Cheap Flights from Philadelphia (PHL) to London (LHR) Prices were available within the past 7 days and start at £212 for one-way flights and £444 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. All deals One way Return ![Aer Lingus](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/EI.gif) Wed, 5 Nov - Wed, 10 Dec PHL Philadelphia LHR London £444 Return found 1 day ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:PHL,to:LHR,departure:05/11/2025TANYT&leg2=from:LHR,to:PHL,departure:10/12/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:443.85&airProductToken=AQpjCi8IxZIBEgMxMTQY71kggw0ohqb8AjCRqfwCOE9AAFgBagRTQVZScghPTFgyQzFCVgowCMWSARIDMTU2GIMNIOuJASjtqvwCMMKr_AI4UEABWAFqBFNBVlJyCE9MWDJDMUJWCmMKMAjFkgESAzE1NRjriQEggw0o7qn_AjDDqv8COFpAAFgBagRTQVZScghPTFgyQzFCVgovCMWSARIDMTE1GIMNIO9ZKKyr_wIwjK__AjhPQAFYAWoEU0FWUnIIT0xYMkMxQlYSCggBEAEYASoCRUkYASIECAEQASgCKAMoBDAN) ![Aer Lingus](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/EI.gif) Tue, 18 Nov - Tue, 25 Nov PHL Philadelphia LHR London £445 Return found 2 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:PHL,to:LHR,departure:18/11/2025TANYT&leg2=from:LHR,to:PHL,departure:25/11/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:444.85&airProductToken=AQpjCi8IxZIBEgMxMTQY71kggw0oprj9AjCxu_0COE9AAFgBagRTQVZScghPTFgyQzFCVgowCMWSARIDMTU0GIMNIOuJASjHvP0CMKG9_QI4R0ABWAFqBFNBVlJyCE9MWDJDMUJWCmMKMAjFkgESAzE1MxjriQEggw0o0oD-AjCngf4COEdAAFgBagRTQVZScghPTFgyQzFCVgovCMWSARIDMTE1GIMNIO9ZKMyC_gIwrIb-AjhPQAFYAWoEU0FWUnIIT0xYMkMxQlYSCggBEAEYASoCRUkYASIECAEQASgCKAMoBDAN) ![Scandinavian Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/SK.gif) Thu, 22 Jan - Thu, 29 Jan PHL Philadelphia LHR London £452 Return found 12 hours ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:PHL,to:LHR,departure:22/01/2026TANYT&leg2=from:LHR,to:PHL,departure:29/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:451.42&airProductToken=AQqjAQo1CNOWARIEMzg4NRjvWSDBkwEoo46DAzCAj4MDOExAAFgBaghTVEFOREFSRHIITExXQUU2RVMKNAjTlgESAzkyOBjBkwEg4jsoy5ODAzCIl4MDOExAAVgBaghTVEFOREFSRHIITExXQUU2RVMKNAjTlgESAzUwMRjiOyDriQEoyZeDAzDQmIMDOExAAVgBaghTVEFOREFSRHIITExXQUU2RVMKpAEKNQjTlgESBDE1MDgY64kBIOI7KPLggwMw4OGDAzhMQABYAWoIU1RBTkRBUkRyCExMV0FFNkVTCjQI05YBEgM5MjcY4jsgwZMBKN_ogwMw4uyDAzhMQAFYAWoIU1RBTkRBUkRyCExMV0FFNkVTCjUI05YBEgQzMzQwGMGTASDvWSjD7oMDMKnvgwM4TEABWAFqCFNUQU5EQVJEcghMTFdBRTZFUxIKCAEQARgBKgJTSxgBIgQIARABKAIoAygEMAE) ![JetBlue Airways](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/b6.gif) Sat, 15 Nov - Mon, 24 Nov PHL Philadelphia LHR London £470 Return found 1 hour ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:PHL,to:LHR,departure:15/11/2025TANYT&leg2=from:LHR,to:PHL,departure:24/11/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:469.82&airProductToken=AQpgCi0IwmwSAzc2MBjvWSDBkwEooJb9AjDylv0COExAAFgBagJETnIIVUwwMkJaTDEKLwjCbBIEMTYyMBjBkwEg64kBKKyX_QIwv5r9AjhMQAFYAWoCRE5yCFVMMDJCWkwxCmAKLwjCbBIEMTYyMRjriQEgwZMBKND1_QIwpvn9AjhMQABYAWoCRE5yCFVMMDJCWkwxCi0IwmwSAzg1ORjBkwEg71kojPv9AjDy-_0COExAAVgBagJETnIIVUwwMkJaTDESCggBEAEYASoCQjYYASIECAEQASgCKAQoBjAB) ![British Airways](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/BA.gif) Tue, 4 Nov - Thu, 6 Nov PHL Philadelphia LHR London £517 Return found 5 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:PHL,to:LHR,departure:04/11/2025TANYT&leg2=from:LHR,to:PHL,departure:06/11/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:516.90&airProductToken=AQojCiEIwoIBEgQxNTg3GO9ZIOuJASjtm_wCMJaf_AI4TkAAWAEKRAogCMKCARIDNDU4GOuJASCMGCiiqvwCMLir_AI4TkAAWAEKIAjCggESBDE2MDYYjBgg71kov6z8AjC4sPwCOE5AAVgBEgoIARABGAEqAkJBGAEiBAgBEAEoBDAB) ![American Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AA.gif) Tue, 28 Oct - Wed, 12 Nov PHL Philadelphia LHR London £523 Return found 3 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:PHL,to:LHR,departure:28/10/2025TANYT&leg2=from:LHR,to:PHL,departure:12/11/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:522.82&airProductToken=AQpoCjIIwYIBEgQxNzc2GO9ZIMGTASjwy_sCMMfM-wI4QkAAWAFqBUJBU0lDcghPTFgyQzFCVgoyCMGCARIDMTA4GMGTASDriQEo78z7AjCE0PsCOEJAAVgBagVCQVNJQ3IIT0xYMkMxQlYKZgoyCMGCARIENjgxMxjriQEgwWgo2O38AjDV7vwCOFNAAFgBagVCQVNJQ3IIT0xYMkMxQlYKMAjBggESAzc0MxjBaCDvWSjS7_wCMO7z_AI4QkABWAFqBUJBU0lDcghPTFgyQzFCVhIKCAEQARgBKgJBQRgBIgQIARABKAIoAygEMAs) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Tue, 18 Nov - Thu, 27 Nov PHL Philadelphia LHR London £524 Return found 6 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:PHL,to:LHR,departure:18/11/2025TANYT&leg2=from:LHR,to:PHL,departure:27/11/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:523.32&airProductToken=AQpECiAI1YIBEgQzNjA1GO9ZIIgYKLy5_QIw_7n9AjhMQABYAQogCNWCARIDOTI0GIgYIOuJASjDuv0CMIq-_QI4TEABWAEKRQohCNWCARIEOTIzMhjriQEgpQQo_pb-AjDdl_4COExAAFgBCiAI1YIBEgQ5NjU4GKUEIO9ZKMuY_gIw7Jz-AjhMQAFYARIKCAEQARgBKgJVQRgBIgQIARABKAQwAQ) ![Air Canada](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AC.gif) Sun, 26 Oct - Tue, 4 Nov PHL Philadelphia LHR London £529 Return found 1 day ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:PHL,to:LHR,departure:26/10/2025TANYT&leg2=from:LHR,to:PHL,departure:04/11/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:528.89&airProductToken=AQpmCjEIwYYBEgQ4ODU4GO9ZIJhdKLmx-wIwl7L7AjhMQABYAWoFQkFTSUNyCExMMjI2TEdUCjEIwYYBEgM4NjQYmF0g64kBKKq2-wIwzrn7AjhMQAFYAWoFQkFTSUNyCExMMjI2TEdUCpsBCjMIwYYBEgQ2MzMwGOuJASChpAEoupP8AjD7k_wCOExAAFgBagVCQVNJQ3IITEwyMjZMR1QKMQjBhgESAzgzMxihpAEgmF0ovJT8AjCNmPwCOExAAVgBagVCQVNJQ3IITEwyMjZMR1QKMQjBhgESBDg4NTkYmF0g71ko4pj8AjDDmfwCOExAAVgBagVCQVNJQ3IITEwyMjZMR1QSCggCEAEYAioCQUMYASIECAEQASgCKAMoBDAB) ![Iberia](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/IB.gif) Sun, 11 Jan - Mon, 26 Jan PHL Philadelphia LHR London £534 Return found 6 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:PHL,to:LHR,departure:11/01/2026TANYT&leg2=from:LHR,to:PHL,departure:26/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:533.62&airProductToken=AQppCjIIyYQBEgQ0NzM1GO9ZIMGTASj7lYIDMMyWggM4T0AAWAFqBUJBU0lDcghPTFgyQzFCVgozCMmEARIEMzU4NxjBkwEg64kBKLuYggMwxpuCAzhPQAFYAWoFQkFTSUNyCE9MWDJDMUJWCpoBCjEIyYQBEgM3MjYY64kBIIwYKJy_gwMwrcCDAzhPQABYAWoFQkFTSUNyCE9MWDJDMUJWCjEIyYQBEgMzNDcYjBggwZMBKNLGgwMw38qDAzhPQAFYAWoFQkFTSUNyCE9MWDJDMUJWCjIIyYQBEgQ0MzAzGMGTASDvWSi3zIMDMJDNgwM4T0ABWAFqBUJBU0lDcghPTFgyQzFCVhIKCAIQARgCKgJJQhgBIgQIARABKAIoAygEMA0) ![Lufthansa](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/LH.gif) Wed, 26 Nov - Tue, 9 Dec PHL Philadelphia LHR London £537 Return found 6 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:PHL,to:LHR,departure:26/11/2025TANYT&leg2=from:LHR,to:PHL,departure:09/12/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:536.03&airProductToken=AQpFCiAIzJABEgQ2NTY1GO9ZIJhdKK6R_gIwjZL-AjhMQABYAQohCMyQARIENjgzORiYXSDriQEoipP-AjCulv4COExAAVgBCkQKIAjMkAESAzkyNRjriQEgpQQo_p3_AjDdnv8COExAAFgBCiAIzJABEgQ0MjcyGKUEIO9ZKNCf_wIw8aP_AjhMQAFYARIKCAEQARgBKgJMSBgBIgQIARABKAQwAQ) ## Find the cheapest month to fly from Philadelphia (PHL) to London (LHR) ### November is typically the cheapest month to fly From £355 - £691 per traveller. ## Alternative airports near London Prices were available within the past 7 days. Prices and availability are subject to change. [](https://www.expedia.co.uk/Flights-Search?leg1=from:PHL,to:LGW,departure:16/10/2025TANYT&leg2=from:LGW,to:PHL,departure:20/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) LGW Gatwick 52 min [Flights from £876](https://www.expedia.co.uk/Flights-Search?leg1=from:PHL,to:LGW,departure:16/10/2025TANYT&leg2=from:LGW,to:PHL,departure:20/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) [](https://www.expedia.co.uk/Flights-Search?leg1=from:PHL,to:LCY,departure:16/10/2025TANYT&leg2=from:LCY,to:PHL,departure:19/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) LCY London City Closest 21 min [Flights from £1,047](https://www.expedia.co.uk/Flights-Search?leg1=from:PHL,to:LCY,departure:16/10/2025TANYT&leg2=from:LCY,to:PHL,departure:19/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) ## Frequently asked questions ### How much is a flight from PHL to London Heathrow? > The lowest price advertised for a round-trip journey from Philadelphia Intl. Airport (PHL) to LHR is £444. But you better move fast. This price is taken from fares quoted within the last 7 days on Expedia for flights departing within the next year. Prices and availability are subject to change. Additional terms apply. ### Do I need to pay a cancellation fee if I cancel my flight from Philadelphia Intl. Airport (PHL) to Heathrow Airport? > Most flights can be cancelled online, but each air carrier has its own set of terms and conditions. If you do decide to cancel your flight, visit our [Customer Service Portal](https://www.expedia.co.uk/service/?langid=1033) and follow the instructions. ### How do I find cheap flights from Philadelphia Intl. Airport (PHL) to Heathrow Airport (LHR) that have flexible change policies? > Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for Philadelphia Airport to LHR flights, you'll see a "no change fees" filter for you to select. ### How far is the flight from PHL to LHR? > With a flight distance of 5,700 kilometres between Philadelphia and Hounslow, this is a long-haul journey. Be sure to stay hydrated and take a short walk down the aisle from time to time. ### Which airlines fly direct from Philadelphia Airport to Heathrow Airport? > A leading airline that operates on the route from PHL to London Heathrow is British Airways (BA). It offers 30 flights every month. Another airline operating on this route is American Airlines (AA). You'll have 26 flights a month to select from. ### Are Philadelphia Intl. Airport (PHL) to Heathrow Airport (LHR) flight tickets cheaper when they're purchased at the last minute? > Booking your trip from Philadelphia Intl. Airport (PHL) to Heathrow Airport (LHR) at the last minute could be your ticket to a great deal. However, it might cost you a whole lot more! If you'd rather avoid the risk, book well ahead of your departure date. In fact, Expedia has some of the best bargains up to 12 months in advance. If your preferred air carrier hasn't released tickets yet, check back often as deals are updated all the time on Expedia. ## Travel information | Origin airport | Philadelphia Intl. | | --- | --- | | Destination airport | Heathrow | | Airlines serving | Aer Lingus, Air Canada, Air France, American Airlines, British Airways, Delta, Finnair, Iberia, Icelandair, JetBlue Airways, KLM, Lufthansa, Scandinavian Airlines, Swiss International Air Lines, TAP Portugal, United, Virgin Atlantic | | Return price | £444 | | Distance | 5656 km | | Average flight time | 12 hours 10 mins | ## Book with confidence ### Compare flights from Philadelphia to London easily and book with confidence For travelling on business or for pleasure, Expedia makes it easy to book your flights from Philadelphia to London. Operating between them 15 flights per day, 20 airlines cover the route. And American Airlines, Aer Lingus, Finnair, Iberia, Malaysia Airlines, British Airways fly direct, getting you to Heathrow in just 7hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Philadelphia Intl. to Heathrow.   To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights.  Grab a great deal on your flight from Philadelphia Intl. (PHL) to Heathrow (LHR) The easiest way to view the best deals on flights from Philadelphia to London today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Philadelphia Intl. to Heathrow start at just £444 and range up to £537.   To find an even better deal, try   - being flexible on your dates – midweek flights can be cheaper - looking for other airports near Philadelphia and London - booking your flight during November, the cheapest month on this route - varying your flight times – early morning and late at night are sometimes cheaper  Why you should book your Philadelphia to London flight with Expedia! We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Philadelphia Intl. to Heathrow for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.   Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.   ## Explore a world of travel with Expedia - Accommodation - Flights - [London Hotels](https://www.expedia.co.uk/London-Hotels.d178279.Travel-Guide-Hotels) - [Flights to London](https://www.expedia.co.uk/Cheap-Flights-To-London.d178279.Travel-Guide-Flights) - [Flights from Abidjan (ABJ) to London (LON)](https://www.expedia.co.uk/lp/flights/abj/lon/abidjan-to-london) - [Flights from Aberdeen (ABZ) to London (LON)](https://www.expedia.co.uk/lp/flights/abz/lon/aberdeen-to-london) - [Flights from Accra (ACC) to London (LON)](https://www.expedia.co.uk/lp/flights/acc/lon/accra-to-london) - [Flights from Izmir (ADB) to London (LON)](https://www.expedia.co.uk/lp/flights/adb/lon/izmir-to-london) - [Flights from Málaga (AGP) to London (LON)](https://www.expedia.co.uk/lp/flights/agp/lon/malaga-to-london) - [Flights from Alicante (ALC) to London (LON)](https://www.expedia.co.uk/lp/flights/alc/lon/alicante-to-london) - 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