Flight Deals from Philadelphia to Los Angeles from $131

Flight prices between Philadelphia and Los Angeles peak in late December and are lowest in early September.

If you're planning a trip from Philadelphia to Los Angeles, consider that flight prices vary significantly throughout the year. The most expensive time to fly is during the late December holiday season, particularly around late December, with prices peaking at around the highest ranges. Conversely, the cheapest flights tend to be available in early September, meaning it's an ideal time for budget travelers. Generally, the high season runs from late March to early April and again from mid-December to the end of the month, while lower prices are often found in late January to late February and mid-October to early November.

Book your flight from Philadelphia to Los Angeles 24 to 32 days before departure for the best prices.

For your trip from Philadelphia to Los Angeles, it's best to book your flight between 24 to 32 days before departure, as this period offers the lowest prices around $306. Booking earlier than 32 days can lead to prices up to $667, making it 118% more expensive. The window from 24 to 17 days also remains reasonable, but prices start to spike significantly beyond that, often reaching $501 within 17 days of departure. Be cautious, as waiting until the last minute can result in high costs—prices increase rapidly, and you risk significant fare hikes.