$323 Cheap American Airlines flights Philadelphia (PHL) to St. Thomas (STT)

Apply the "Price (lowest to highest)" filter on Expedia to look for cheap American Airlines round-trip flights from $570 from PHL to STT. Affordable one-way tickets from $323 are also available.**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.

Landing the best American Airlines deals from PHL to STT often comes down to booking at the right moment. You can save 17% on international flights when you book 18 to 29 days before takeoff instead of four to five months ahead. What's more, you can pocket 17% on average by buying your fare on a Sunday rather than a Friday, which is usually the most expensive day to book.* It's smart to kick off your flight search about one month before your travel dates.*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 earliest American Airlines flight from PHL to STT departs at 8:29AM UTC-5, arriving at 1:29PM UTC-4. If you'd like to jet off later in the day, the last American Airlines flight leaves PHL at 8:29AM UTC-5 and lands at STT at 1:29PM UTC-4. Flying before noon is often a good idea as morning flights are least likely to experience cancellations.**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.