Flight Deals from Philadelphia to Chicago O Hare Airport from $34

Flying from Philadelphia to Chicago is most expensive in late March and mid-June, while early January and mid-September offer the lowest fares.

When flying from Philadelphia to Chicago, you'll find that ticket prices vary significantly throughout the year. The peak travel seasons typically occur during late March and mid-June, with prices often rising above $250, peaking at an average of around $300 during late December. Conversely, the low seasons, characterized by much lower fares averaging below $224, span early January and mid-September. Notable price dips can be observed in early January and early December, while significant peaks emerge during key festive periods, particularly around late March and late December.

Book your Philadelphia to Chicago flight 34 days before departure for the lowest prices; avoid booking later as prices increase significantly.

For your trip from Philadelphia to Chicago, the optimal time to buy tickets is about 34 days before departure when prices are at their lowest, typically around $215. If you buy earlier, prices can soar to $386, which is significantly higher. While there are some lower fares closer to departure, they are inconsistent and risky; hence, it’s advisable to secure your tickets sooner rather than later. Be cautious, as prices tend to escalate sharply as you approach the departure date, especially if buying within the last 14 days, where costs can reach up to $403. Therefore, if your departure is less than 34 days away, book immediately to avoid higher prices.