Philadelphia International Airport recommends that passengers arrive at least two hours prior to domestic flights and three hours before international flights. This guideline helps ensure enough time for check-in, security screening, and any unexpected delays that may arise. It is also important to consider factors such as the airline you are flying with, the day of the week, and the time of year, as these can influence airport traffic and the speed of processing through security. Additionally, arriving early allows travelers to navigate the airport comfortably, find their gates, and perhaps even enjoy some of the various amenities PHL has to offer. For the most accurate and up-to-date information, including specific recommendations from airlines, it is advisable to check the airport's current web page.