Greer to Philadelphia

What the Data Says About GSP to PHL

The Greer to Philadelphia corridor (GSP → PHL) covers roughly 515 miles and is served by 4 carriers, based on Bureau of Transportation Statistics reporting. Across 2,248 flights in the dataset, this route posts a 85.5% on-time rate with an average delay of 96.6 minutes when flights run late. Over the most recent 24 months of BTS data, 1,061 flights were recorded on this pairing — 23 cancelled (2.2%) and 0 diverted (0.0%). Those baseline metrics tell you what to expect before you book.

Having 4 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 2,248 total flights analyzed, the 85.5% on-time figure is statistically meaningful rather than a small-sample fluke. The 96.6-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, Sep 2025 posted the best performance on this corridor at 97% on-time, while Jul 2024 came in at 69% on-time — a 29-point gap between best and worst recent month. For travelers evaluating the GSP to PHL route, the combination of a 85.5% on-time rate, 96.6-minute average delay, 2.2% recent cancellation rate, and 4 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.