$99 Cheap American Airlines flights Denver (DEN) to Philadelphia (PHL)

Grab cheap round-trip American Airlines flights from $197 from DEN to PHL by sorting your results from "Price (lowest to highest)" on Expedia. Or look for deals from $99 for a one-way trip.**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.

Search for affordable American Airlines flights from Denver Intl. Airport (DEN) to Philadelphia Intl. Airport (PHL) one to three months prior to your departure date. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. No matter the fare type and journey, the ideal day to book a domestic flight is generally Sunday and the most expensive day tends to be Monday. Passengers who book on a Sunday can save 6% on average compared to those who book their travel on a Monday.**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 DEN to PHL takes off at 6:37AM UTC-7, landing at 12:26PM UTC-5. If you prefer to head off later in the day, the last American Airlines flight leaves DEN at 1:38PM UTC-7 and touches down at PHL at 7:19PM UTC-5. Flying before noon is often a good idea as morning and mid-morning flights are 20% less likely to be canceled.**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.