Greer to Chicago

What the Data Says About GSP to ORD

The Greer to Chicago corridor (GSP → ORD) covers roughly 577 miles and is served by 24 carriers, based on Bureau of Transportation Statistics reporting. Across 6,603 flights in the dataset, this route posts a 81.7% on-time rate with an average delay of 76.6 minutes when flights run late. Over the most recent 24 months of BTS data, 2,961 flights were recorded on this pairing — 56 cancelled (1.9%) and 10 diverted (0.3%). Those baseline metrics tell you what to expect before you book.

Having 24 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 6,603 total flights analyzed, the 81.7% on-time figure is statistically meaningful rather than a small-sample fluke. The 76.6-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 2025 posted the best performance on this corridor at 91% on-time, while Jul 2025 came in at 62% on-time — a 28-point gap between best and worst recent month. For travelers evaluating the GSP to ORD route, the combination of a 81.7% on-time rate, 76.6-minute average delay, 1.9% recent cancellation rate, and 24 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.