Chicago to Philadelphia

What the Data Says About ORD to PHL

The Chicago to Philadelphia corridor (ORD → PHL) covers roughly 678 miles and is served by 30 carriers, based on Bureau of Transportation Statistics reporting. Across 23,837 flights in the dataset, this route posts a 77.8% on-time rate with an average delay of 89.9 minutes when flights run late. Over the most recent 24 months of BTS data, 9,082 flights were recorded on this pairing — 139 cancelled (1.5%) and 18 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 23,837 total flights analyzed, the 77.8% on-time figure is statistically meaningful rather than a small-sample fluke. The 89.9-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 85% on-time, while Jul 2025 came in at 58% on-time — a 28-point gap between best and worst recent month. For travelers evaluating the ORD to PHL route, the combination of a 77.8% on-time rate, 89.9-minute average delay, 1.5% recent cancellation rate, and 30 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.