Airport reliability
Greer (GSP) on-time performance
How reliably flights leave Greer, SC (GSP) and reach their destinations, by airline, departure hour and month, September 2025 to August 2026.
Greer, SC14,257 departures in 12 months
- Departures on time
- 78.5% U.S. average 75.6%
- Cancelled
- 2.8% U.S. average 1.9%
- 60+ minutes late
- 7.6% U.S. average 8.1%
- Scheduled departures
- 14,257 12 months
What this means
GSP departures beat the U.S. average.
- 78.5% of the 14,257 scheduled departures from Greer (GSP) arrived at their destination on time, 2.9 points higher than the U.S. average of 75.6%.
- 2.8% of departures were cancelled (U.S. average 1.9%), and 7.6% arrived an hour or more late.
- Flights arriving at GSP were on time 73.6% of the time.
- Among airlines with at least 300 departures, Delta Air Lines was the most punctual from GSP (88.6%) and Allegiant Air the least (57.6%).
- Over the last 3 years, October was the most reliable month for departures from GSP (85.7% on time) and July the least reliable (70.0%).
- Cancellations peaked in January, when 5.4% of flights were cancelled.
- Flights scheduled to depart before 6 am were the most punctual (92.8% on time); flights scheduled to depart 8 pm to 9 pm were the least (60.0%).
Airlines at GSP
Ranked by on-time arrival
| Airline | On time | Cancelled | 60+ min late | Avg delay when late | Departures |
|---|---|---|---|---|---|
| Delta Air Lines | 88.6% | 1.8% | 4.4% | 84 min | 3,196 |
| Southwest Airlines | 85.9% | 1.1% | 3.4% | 51 min | 1,596 |
| United Airlines | 79.6% | 0.4% | 8.0% | 78 min | 226 |
| Republic AirwaysSold as American Eagle, Delta Connection, United Express | 76.0% | 5.5% | 8.1% | 80 min | 2,031 |
| Envoy AirSold as American Eagle | 75.7% | 2.2% | 6.9% | 66 min | 1,990 |
| American Airlines | 74.5% | 3.6% | 9.3% | 99 min | 1,059 |
| PSA AirlinesSold as American Eagle | 74.0% | 3.6% | 10.4% | 105 min | 2,731 |
| SkyWest AirlinesSold as United Express, Delta Connection, American Eagle, Alaska | 71.7% | 3.7% | 9.8% | 84 min | 926 |
| Allegiant Air | 57.6% | 0.8% | 18.9% | 84 min | 502 |
Tap a heading to sort.
On-time rate by departure hour
Share of scheduled flights on time GSP average 78.5%
Show as table
| Period | On time | Flights |
|---|---|---|
| Departing before 6 am | 92.8% | 622 |
| Departing 6 am to 7 am | 87.0% | 2,220 |
| Departing 7 am to 8 am | 83.6% | 1,815 |
| Departing 8 am to 9 am | 86.1% | 900 |
| Departing 9 am to 10 am | 86.3% | 263 |
| Departing 10 am to 11 am | 84.9% | 985 |
| Departing 11 am to noon | 81.9% | 956 |
| Departing noon to 1 pm | 79.6% | 1,115 |
| Departing 1 pm to 2 pm | 82.8% | 565 |
| Departing 2 pm to 3 pm | 80.3% | 244 |
| Departing 3 pm to 4 pm | 71.9% | 463 |
| Departing 4 pm to 5 pm | 74.3% | 755 |
| Departing 5 pm to 6 pm | 63.5% | 1,149 |
| Departing 6 pm to 7 pm | 64.6% | 921 |
| Departing 7 pm to 8 pm | 61.2% | 753 |
| Departing 8 pm to 9 pm | 60.0% | 482 |
| Departing 9 pm to 10 pm | Insufficient sample | 45 |
| Departing 10 pm to 11 pm | Insufficient sample | 4 |
Best and worst months at GSP
Share of scheduled flights on time 12-month average 78.5%
Show as table
| Period | On time | Flights |
|---|---|---|
| January | 77.8% | 3,414 |
| February | 83.0% | 3,278 |
| March | 80.6% | 3,686 |
| April | 84.7% | 3,590 |
| May | 77.6% | 4,016 |
| June | 75.3% | 3,890 |
| July | 70.0% | 4,120 |
| August | 78.6% | 3,966 |
| September | 85.3% | 3,603 |
| October | 85.7% | 3,892 |
| November | 85.4% | 3,687 |
| December | 81.3% | 3,673 |
Month by month, last 12 months
Share of scheduled flights on time U.S. average 75.6%
Show as table
| Period | On time | Flights |
|---|---|---|
| Sep 2025 | 88.5% | 1,148 |
| Oct 2025 | 83.6% | 1,199 |
| Nov 2025 | 79.4% | 1,144 |
| Dec 2025 | 76.0% | 1,153 |
| Jan 2026 | 72.2% | 1,109 |
| Feb 2026 | 79.5% | 1,056 |
| Mar 2026 | 74.7% | 1,203 |
| Apr 2026 | 86.2% | 1,120 |
| May 2026 | 82.8% | 1,302 |
| Jun 2026 | 74.3% | 1,250 |
| Jul 2026 | 70.5% | 1,303 |
| Aug 2026 | 75.9% | 1,270 |
Busiest routes from GSP
| To | On time | Cancelled | Airlines | Flights |
|---|---|---|---|---|
| Atlanta (ATL) | 88.6% | 1.6% | 1 | 2,798 |
| Chicago (ORD) | 72.5% | 3.8% | 6 | 1,870 |
| Charlotte (CLT) | 80.0% | 2.7% | 3 | 1,538 |
| Dallas/Fort Worth (DFW) | 74.0% | 2.6% | 3 | 1,175 |
| Washington (DCA) | 60.8% | 5.5% | 2 | 999 |
| New York (LGA) | 70.0% | 5.9% | 1 | 914 |
| Newark (EWR) | 81.9% | 5.7% | 1 | 784 |
| Nashville (BNA) | 83.2% | 0.4% | 1 | 730 |
| Miami (MIA) | 78.1% | 1.2% | 2 | 723 |
| Baltimore (BWI) | 88.0% | 1.7% | 1 | 719 |
| Detroit (DTW) | 84.8% | 3.1% | 2 | 520 |
| Philadelphia (PHL) | 86.8% | 2.3% | 1 | 441 |
| Denver (DEN) | 79.9% | 1.4% | 2 | 364 |
| Houston (HOU) | 89.1% | 2.0% | 1 | 147 |
| Fort Lauderdale (FLL) | 39.7% | 1.5% | 1 | 136 |
| Sanford (SFB) | 64.2% | 0.7% | 1 | 134 |
| St. Petersburg (PIE) | 52.3% | 0.0% | 1 | 132 |
| Sarasota/Bradenton (SRQ) | 80.0% | 1.0% | 1 | 100 |
Sources & data dates
- Source
- U.S. DOT Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987-present)
- Period
- September 2025 to August 2026 (12 months); month-of-year patterns September 2023 to August 2026
- Data through
- August 2026
- Processed
- 2026-11-03
- Scope
- Scheduled nonstop domestic departures from Greer, SC (GSP) by airlines that report to the DOT.
- Method
- Rates use all scheduled flights as the denominator; cancelled and diverted flights count as not on time. Figures based on fewer than 50 scheduled flights are suppressed. Full methodology.