$444 Cheap American Airlines flights Philadelphia (PHL) to London (LHR)

Apply the "Price (lowest to highest)" filter on Expedia to look for cheap American Airlines round-trip flights from $422 from PHL to LHR. Affordable one-way options from $444 are available as well.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

To discover affordable flights from PHL to LHR with American Airlines, start your search about one month before your intended departure. You can save 17% when you lock in your international tickets 18 to 29 days ahead instead of booking four to five months in advance. Want another tip? Booking on Sunday offers average savings of 17% compared to Friday (the most expensive day).**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.

The first flight from PHL to LHR with American Airlines departs at 9:21PM UTC-5. You'll touch down at 9:20AM UTC+0. The last American Airlines flight of the day takes off at 9:21PM UTC-5 and arrives at 9:20AM UTC+0. With around 20% fewer cancellations for morning and mid-morning departures, jetting out early is typically the wisest option.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.