From most locations, the cheapest flights to Philadelphia can be found during the month of March; however great deals can be found at other times.
In general, most flyers find the cheapest time to book a flight to Philadelphia is about 60 days prior.
From most locations, the cheapest day to fly to Philadelphia is Wednesday. Most users found that departing on a Monday was most expensive.
On average you can find the best deals on plane tickets to Philadelphia when looking for flights with morning departure times.