Baltimore to Greer

What the Data Says About BWI to GSP

The Baltimore to Greer corridor (BWI → GSP) covers roughly 426 miles and is served by 1 carrier, based on Bureau of Transportation Statistics reporting. Across 2,270 flights in the dataset, this route posts a 78.4% on-time rate with an average delay of 60.5 minutes when flights run late. Over the most recent 24 months of BTS data, 1,279 flights were recorded on this pairing — 8 cancelled (0.6%) and 4 diverted (0.3%). Those baseline metrics tell you what to expect before you book.

Having 1 carrier on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 2,270 total flights analyzed, the 78.4% on-time figure is statistically meaningful rather than a small-sample fluke. The 60.5-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, Sep 2025 posted the best performance on this corridor at 92% on-time, while Jun 2025 came in at 63% on-time — a 28-point gap between best and worst recent month. For travelers evaluating the BWI to GSP route, the combination of a 78.4% on-time rate, 60.5-minute average delay, 0.6% recent cancellation rate, and 1 available carrier is the concrete summary of what BTS data shows about reliability on this pairing.