Chicago to Greer

What the Data Says About ORD to GSP

The Chicago to Greer corridor (ORD → GSP) covers roughly 577 miles and is served by 26 carriers, based on Bureau of Transportation Statistics reporting. Across 6,594 flights in the dataset, this route posts a 79.6% on-time rate with an average delay of 73.8 minutes when flights run late. Over the most recent 24 months of BTS data, 2,953 flights were recorded on this pairing — 63 cancelled (2.1%) and 4 diverted (0.1%). Those baseline metrics tell you what to expect before you book.

Having 26 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 6,594 total flights analyzed, the 79.6% on-time figure is statistically meaningful rather than a small-sample fluke. The 73.8-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 89% on-time, while Jun 2025 came in at 60% on-time — a 29-point gap between best and worst recent month. For travelers evaluating the ORD to GSP route, the combination of a 79.6% on-time rate, 73.8-minute average delay, 2.1% recent cancellation rate, and 26 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.