$82 Cheap Frontier Airlines flights Philadelphia (PHL) to Chicago (ORD)

Set the “Price (lowest to highest)” filter on Expedia to search for cheap Frontier Airlines return flights from $159 from PHL to ORD. Affordable one-way fares from $82 are also on offer.**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.

January is one of the cheapest months to travel to Chicago with Frontier Airlines. You could also find fantastic deals on return and one-way fares in February.

Begin your search one to three months ahead of your departure date to score cheaper fares on Frontier Airlines flights from Philadelphia Intl. Airport (PHL) to O’Hare Intl. Airport (ORD). You can save 25% by booking your domestic flight 34 to 86 days in advance compared to last-minute reservations made 6 to 12 days out. You could also cut costs by buying your fare on a Sunday, as it’s 6% cheaper on average than a Monday, the most expensive day to book.* Get your timing spot on, and you can enjoy significant savings on domestic journeys.*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.

Click on the “Nonstop” filter when browsing for direct Frontier Airlines flights from PHL to ORD. You’ll also be able to compare other carriers servicing the same direct route.

Search Frontier Airlines’s earliest flights from PHL to ORD by selecting our “Early Morning” and “Morning” filters. Not only will you arrive sooner, early departures also have a 20% less chance of being 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.

Frontier Airlines flights from Philadelphia Intl. Airport (PHL) to Chicago come in to land at O’Hare Intl. Airport (ORD). This is the main entry point to this destination.

Journey from PHL to ORD with Frontier Airlines and you can look forward to a host of benefits starting with a rewarding loyalty program. When booking through Expedia as a Frontier Miles and One Key™ member, you can also earn OneKeyCash™* to use on select future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Changes are generally free within 24 hours of booking, but your airline may charge a fee after that. For further details about modifying your flights, head to your “Trips,” select your flight and click on “Manage Booking.” If you want the freedom to change your itinerary without additional costs, tick the “No cancel fee” or “Changes included” filter when planning your next adventure.