Philadelphia to Chicago

What the Data Says About PHL to ORD

The Philadelphia to Chicago corridor (PHL → ORD) covers roughly 678 miles and is served by 30 carriers, based on Bureau of Transportation Statistics reporting. Across 23,846 flights in the dataset, this route posts a 83.4% on-time rate with an average delay of 90.2 minutes when flights run late. Over the most recent 24 months of BTS data, 9,081 flights were recorded on this pairing — 157 cancelled (1.7%) and 20 diverted (0.2%). Those baseline metrics tell you what to expect before you book.

Having 30 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 23,846 total flights analyzed, the 83.4% on-time figure is statistically meaningful rather than a small-sample fluke. The 90.2-minute average delay applies only to flights that actually ran late, so it is not the average wait across all departures — the majority of flights on this route depart on time under the BTS definition of a delay (15+ minutes past schedule).

Looking at recent months, Feb 2024 posted the best performance on this corridor at 90% on-time, while Jul 2025 came in at 63% on-time — a 27-point gap between best and worst recent month. For travelers evaluating the PHL to ORD route, the combination of a 83.4% on-time rate, 90.2-minute average delay, 1.7% recent cancellation rate, and 30 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.