Greenville Spartanburg International Airport (GSP) on-time performance, September 2026
1,628 scheduled airline departures from Greer in September 2026, 77.2% of them on time. Measured from FAA departure data, updated every morning.
On time, day by day
Share of departures within 15 minutes of schedule, by day. Light bars show each day's departures for context. Worst day: Thursday 3 September at 53.1%. Best: Wednesday 16 September at 95.2%.
Airlines at GSP, ranked by on-time share
Scheduled airlines with at least 30 departures from GSP in the month. Regional partners (SkyWest, Republic, Envoy and the like) appear under their own names; fractional and charter operators are in the totals but not listed.
| Airline | Departures | On time | 45+ min late | Avg delay (min) |
|---|---|---|---|---|
| United Parcel Service UPS | 32 | 90.6% | 3.1% | -1.7 |
| Delta Air Lines DAL | 217 | 90.3% | 4.1% | 2.6 |
| Breeze Airways MXY | 89 | 85.4% | 7.9% | -0.7 |
| United Airlines UAL | 42 | 83.3% | 4.8% | 14.6 |
| Mesa Airlines ASH | 48 | 81.2% | 4.2% | 6.5 |
| Endeavor Air EDV | 136 | 80.9% | 13.2% | 19.5 |
| SkyWest SKW | 36 | 80.6% | 8.3% | 10.5 |
| Southwest Airlines SWA | 125 | 80.0% | 11.2% | 11.0 |
| GoJet Airlines GJS | 59 | 78.0% | 11.9% | 15.7 |
| CommutAir UCA | 33 | 75.8% | 9.1% | 10.8 |
| Envoy Air ENY | 141 | 75.2% | 12.8% | 16.5 |
| Republic Airways RPA | 167 | 73.7% | 16.2% | 22.0 |
| PSA Airlines JIA | 181 | 69.1% | 12.2% | 19.6 |
| Piedmont Airlines PDT | 153 | 68.0% | 10.5% | 22.3 |
| American Airlines AAL | 68 | 58.8% | 20.6% | 39.9 |
Destinations with the longest delays
Routes from GSP with at least 20 departures, by average departure delay.
| To | Flights | On time | Avg delay |
|---|---|---|---|
| LGA New York | 153 | 73.9% | 29.6 |
| PHL Philadelphia | 74 | 75.7% | 24.4 |
| CLT Charlotte | 208 | 65.9% | 22.1 |
| DFW Dallas-Fort Worth | 82 | 69.5% | 21.9 |
| DCA Washington | 67 | 67.2% | 21.2 |
| ORD Chicago | 171 | 76.6% | 19.6 |
| BWI Baltimore | 50 | 84.0% | 16.7 |
| FLL Fort Lauderdale | 20 | 75.0% | 16.1 |
| IAD Washington | 69 | 76.8% | 14.6 |
| DEN Denver | 26 | 80.8% | 13.6 |
Busiest destinations
The ten routes with the most departures from GSP this month.
| To | Flights | On time | Avg delay |
|---|---|---|---|
| CLT Charlotte | 208 | 65.9% | 22.1 |
| ATL Atlanta | 201 | 89.1% | 3.1 |
| ORD Chicago | 171 | 76.6% | 19.6 |
| LGA New York | 153 | 73.9% | 29.6 |
| EWR Newark | 86 | 82.6% | 4.5 |
| DFW Dallas-Fort Worth | 82 | 69.5% | 21.9 |
| BNA Nashville | 75 | 77.3% | 7.1 |
| PHL Philadelphia | 74 | 75.7% | 24.4 |
| IAD Washington | 69 | 76.8% | 14.6 |
| DTW Detroit | 68 | 89.7% | 9.4 |
Other months for GSP
Airline pages for September 2026
How we measure
On time means the aircraft took off within 15 minutes of its scheduled departure, after subtracting the departure airport's normal taxi time at GSP (FAA SWIM reports wheels-off, not push-back, so the median taxi time of the last 30 days is taken off every flight first). Average delay is the mean of that taxi-adjusted delay over all departures; early departures count as negative minutes, so an operator that routinely leaves early can show a negative average. 45+ min late is the share of departures that left 45 minutes or more behind schedule, the point at which most connections are at risk.
Scope: scheduled airlines only, the same set as the monthly State of the Sky report (operators with published routes; private, fractional and charter operators are left out), so the two publications give the same numbers for the same month. Departures are counted by scheduled day (UTC). Each day's flights are rolled up overnight and published the next morning; the newest day keeps filling in for a day or two and is only shown once it is substantially complete. Figures can differ by a few tenths of a point from the State of the Sky report for the same month: that report is frozen on the 2nd of the following month, while these pages are rebuilt from the live rollup, which recomputes each airport's taxi baseline nightly and re-rolls the last week of the month as late departure times arrive (September 2026 at SFO: 16,398 departures in both, 69.2% on time here against 69.5% in the report).
Source: FAA System Wide Information Management (SWIM) flight plans and departure times, processed by PlaneTrack. Free to quote with credit to PlaneTrack (CC BY 4.0).