Greenville-Spartanburg International (GSP) Delays and On-Time Departures
Greer, SC · ranked 150th of 333 airports for on-time departures
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, Greer (GSP) had 14,201 scheduled departures and 81.1% of them left on time (US average 77.4%).
That ranks 150th of 333 US airports tracked on this site, with 2.7% of departures cancelled.
Among airlines at Greer (GSP), Delta Air Lines left on time most often (88.7%).
Over 24 months, Wednesday was the most reliable day (84% on time) and July the worst month (71%).
Best time of day to fly out of Greer (GSP)
On-time departure % by scheduled departure hour (local time), last 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 94.1% | 1.0% | 1,685 |
| 6am–7am | 91.5% | 2.1% | 4,050 |
| 7am–8am | 88.5% | 2.2% | 3,694 |
| 8am–9am | 90.7% | 2.1% | 1,592 |
| 9am–10am | 88.7% | 2.0% | 695 |
| 10am–11am | 84.4% | 1.4% | 1,977 |
| 11am–12pm | 82.2% | 1.1% | 2,204 |
| 12pm–1pm | 80.6% | 2.0% | 2,182 |
| 1pm–2pm | 82.0% | 0.6% | 821 |
| 2pm–3pm | 81.3% | 1.1% | 926 |
| 3pm–4pm | 74.0% | 1.4% | 840 |
| 4pm–5pm | 77.6% | 1.6% | 1,965 |
| 5pm–6pm | 70.7% | 3.9% | 2,078 |
| 6pm–7pm | 69.7% | 3.7% | 2,152 |
| 7pm–8pm | 64.8% | 5.2% | 1,549 |
| 8pm–9pm | 64.2% | 2.8% | 920 |
| 9pm–10pm | 45.0% | 0.9% | 110 |
| 10pm–11pm | 48.6% | 2.7% | 74 |
Airlines at GSP ranked by on-time departures
Last 12 months. Airlines with fewer than 30 departures are marked “limited data”.
| Airline | On-time departures | On-time arrivals | Cancelled | Departures |
|---|---|---|---|---|
| Delta Air Lines | 88.7% | 90.2% | 1.7% | 3,214 |
| United Airlines | 83.4% | 79.5% | 0.0% | 223 |
| Republic Airways | 83.2% | 80.7% | 4.8% | 2,036 |
| Southwest Airlines | 81.4% | 87.1% | 1.1% | 1,563 |
| SkyWest Airlines | 80.0% | 76.1% | 3.7% | 913 |
| PSA Airlines | 78.5% | 78.2% | 3.2% | 2,766 |
| Envoy Air | 77.8% | 77.7% | 2.2% | 1,914 |
| American Airlines | 76.4% | 77.1% | 3.8% | 1,073 |
| Allegiant Air | 61.0% | 59.2% | 0.8% | 499 |
80%+ good 70–79.9% fair <70% poor
Best day to fly out of GSP
On-time departures by day, 24 months.
Best month to fly out of GSP
On-time departures by month, 24 months.
Holiday travel at Greer (GSP)
On-time departures during holiday periods compared with all other days, last 24 months.
| Period | On-time departures | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 81.6% | -2.1 pts | 2.5% | 591 |
| Christmas & New Year (Dec 20 - Jan 3) | 78.7% | -5.0 pts | 1.1% | 1,096 |
| Summer peak (Jun 15 - Aug 15) | 73.4% | -10.4 pts | 3.0% | 5,302 |
| All other days | 83.7% | — | 2.1% | 22,525 |
Monthly on-time departure trend at GSP
On-time departure % each month, with the 12-month US average for reference.
Routes from Greer (GSP)
Every route from GSP with its own page, by number of flights (last 12 months, on-time arrivals).
| To | On time | Cancelled | Flights |
|---|---|---|---|
| GSP → Atlanta (ATL) | 90.2% | 1.6% | 2,819 |
| GSP → Chicago (ORD) | 76.5% | 4.0% | 1,813 |
| GSP → Charlotte (CLT) | 83.6% | 2.5% | 1,504 |
| GSP → Dallas/Fort Worth (DFW) | 75.6% | 2.9% | 1,177 |
| GSP → Washington (DCA) | 66.0% | 4.7% | 1,017 |
| GSP → New York (LGA) | 75.3% | 5.4% | 927 |
| GSP → Newark (EWR) | 86.0% | 4.6% | 776 |
| GSP → Miami (MIA) | 80.2% | 1.2% | 726 |
| GSP → Baltimore (BWI) | 90.1% | 1.5% | 719 |
| GSP → Nashville (BNA) | 83.4% | 0.5% | 668 |
| GSP → Detroit (DTW) | 87.3% | 2.7% | 550 |
| GSP → Philadelphia (PHL) | 88.7% | 2.0% | 441 |
| GSP → Denver (DEN) | 81.2% | 1.1% | 366 |
| GSP → Houston (HOU) | 89.4% | 1.7% | 173 |