Greer to Detroit

What the Data Says About GSP to DTW

The Greer to Detroit corridor (GSP → DTW) covers roughly 508 miles and is served by 13 carriers, based on Bureau of Transportation Statistics reporting. Across 2,871 flights in the dataset, this route posts a 89.8% on-time rate with an average delay of 111.5 minutes when flights run late. Over the most recent 24 months of BTS data, 1,429 flights were recorded on this pairing — 14 cancelled (1.0%) and 3 diverted (0.2%). Those baseline metrics tell you what to expect before you book.

Having 13 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 2,871 total flights analyzed, the 89.8% on-time figure is statistically meaningful rather than a small-sample fluke. The 111.5-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, Jul 2023 posted the best performance on this corridor at 96% on-time, while Jul 2024 came in at 76% on-time — a 20-point gap between best and worst recent month. For travelers evaluating the GSP to DTW route, the combination of a 89.8% on-time rate, 111.5-minute average delay, 1.0% recent cancellation rate, and 13 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.