Detroit to Greer

What the Data Says About DTW to GSP

The Detroit to Greer corridor (DTW → GSP) covers roughly 508 miles and is served by 15 carriers, based on Bureau of Transportation Statistics reporting. Across 2,873 flights in the dataset, this route posts a 84.3% on-time rate with an average delay of 79.8 minutes when flights run late. Over the most recent 24 months of BTS data, 1,430 flights were recorded on this pairing — 12 cancelled (0.8%) and 5 diverted (0.3%). Those baseline metrics tell you what to expect before you book.

Having 15 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 2,873 total flights analyzed, the 84.3% on-time figure is statistically meaningful rather than a small-sample fluke. The 79.8-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, Oct 2024 posted the best performance on this corridor at 97% on-time, while Dec 2025 came in at 61% on-time — a 36-point gap between best and worst recent month. For travelers evaluating the DTW to GSP route, the combination of a 84.3% on-time rate, 79.8-minute average delay, 0.8% recent cancellation rate, and 15 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.