Philadelphia to Greer

What the Data Says About PHL to GSP

The Philadelphia to Greer corridor (PHL → GSP) covers roughly 515 miles and is served by 3 carriers, based on Bureau of Transportation Statistics reporting. Across 2,337 flights in the dataset, this route posts a 77.7% on-time rate with an average delay of 88.4 minutes when flights run late. Over the most recent 24 months of BTS data, 1,051 flights were recorded on this pairing — 20 cancelled (1.9%) and 1 diverted (0.1%). Those baseline metrics tell you what to expect before you book.

Having 3 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 2,337 total flights analyzed, the 77.7% on-time figure is statistically meaningful rather than a small-sample fluke. The 88.4-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 89% on-time, while Aug 2024 came in at 57% on-time — a 32-point gap between best and worst recent month. For travelers evaluating the PHL to GSP route, the combination of a 77.7% on-time rate, 88.4-minute average delay, 1.9% recent cancellation rate, and 3 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.