Airports › South Carolina
Airport · 12 months to July 2026
Greenville-Spartanburg International: delays and on-time record
Greer, South Carolina
BTS: A flight is counted as on time if it arrived less than 15 minutes after its scheduled time. Only carriers with at least 0.5 percent of domestic scheduled passenger revenue report. Data through July 2026; this is a monthly history, not live airport status.
Reporting carriers scheduled 14,201 domestic departures from Greenville-Spartanburg International (GSP), Greer, in the 12 months to July 2026: about 39 a day to 22 destinations.
79.0% of those flights left the gate less than 15 minutes late, 2.9 points above the national departure figure of 76.1%. Flights arriving at GSP were on time 74.2% of the time, 1.8 points below the national arrival figure of 76.0%.
2.7% of scheduled departures were cancelled (national: 1.8%), and the average departure delay, counting early and on-time departures as zero, was 16.1 min.
Delta Air Lines is the largest reporting carrier at GSP with 23% of departures. Among carriers with at least 142 departures, Delta Air Lines had the highest on-time arrival share for its GSP departures (88.6%) and Allegiant Air the lowest (58.5%).
On-time departures are down 1.7 points on the previous 12 months (80.7%).
Of the delay minutes that carriers assigned to a BTS cause category for flights leaving GSP, late-arriving aircraft 43%, air carrier 30% and national aviation system 19%.
- On time 78.9%
- Arrived 15+ minutes late 18.1%
- Cancelled 2.7%
- Diverted 0.3%
As origin and as destination, against the nation
| Measure | Departures from GSP | Arrivals at GSP | All reported flights | GSP departures, previous 12 months |
|---|---|---|---|---|
| Departed on time (less than 15 min late) | 79.0% | 75.2% | 76.1% | 80.7% |
| Arrived on time | 78.9% | 74.2% | 76.0% | 79.4% |
| Cancelled | 2.7% | 2.7% | 1.8% | 1.8% |
| Diverted | 0.3% | 0.1% | 0.3% | 0.3% |
| Average departure delay (late minutes only) | 16.1 min | 16.9 min | 17.4 min | 15.2 min |
| Arrival delay minutes per 100 flights | 1,550 | 1,687 | 1,684 | 1,530 |
| Scheduled flights | 14,201 | 14,203 | 7,043,858 | 15,313 |
12 months to July 2026. The first column follows flights that left GSP; the second follows flights that landed there. Year on year, on-time departures moved −1.7 pts.
Airlines at GSP
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| DL Delta Air Lines | 3,214 | 23% | 88.6% | -5.7 min | 1.7% |
| OH PSA Airlines | 2,766 | 19% | 75.5% | 10.7 min | 3.2% |
| YX Republic Airline | 2,036 | 14% | 76.6% | 5.5 min | 4.8% |
| MQ Envoy Air | 1,914 | 13% | 75.7% | 6.1 min | 2.2% |
| WN Southwest Airlines | 1,563 | 11% | 85.9% | -2.1 min | 1.1% |
| AA American Airlines | 1,073 | 8% | 73.9% | 13.7 min | 3.8% |
| OO SkyWest Airlines | 913 | 6% | 72.9% | 12.8 min | 3.7% |
| G4 Allegiant Air | 499 | 4% | 58.5% | 27.3 min | 0.8% |
| UA United Airlines | 223 | 2% | 78.5% | 6.4 min | 0.0% |
Departures from GSP by reporting carrier, ordered by flights; on time means the flight reached its destination less than 15 minutes late. Green is at or above the airport's overall share of 78.9%. Carriers fly different routes at different hours, so the rows are not a like-for-like test.
Busiest routes from GSP
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| GSP–ATL | Greer to Atlanta | 2,819 | 88.6% | -5.0 min | 1.6% |
| GSP–ORD | Greer to Chicago | 1,813 | 73.0% | 7.4 min | 4.0% |
| GSP–CLT | Greer to Charlotte | 1,504 | 81.5% | 6.2 min | 2.5% |
| GSP–DFW | Greer to Dallas/Fort Worth | 1,177 | 72.9% | 14.3 min | 2.9% |
| GSP–DCA | Greer to Washington | 1,017 | 62.7% | 23.0 min | 4.7% |
| GSP–LGA | Greer to New York | 927 | 70.9% | 13.4 min | 5.4% |
| GSP–EWR | Greer to Newark | 776 | 82.0% | -1.1 min | 4.6% |
| GSP–MIA | Greer to Miami | 726 | 79.2% | 5.7 min | 1.2% |
| GSP–BWI | Greer to Baltimore | 719 | 88.6% | -2.9 min | 1.5% |
| GSP–BNA | Greer to Nashville | 668 | 82.8% | -0.1 min | 0.4% |
| GSP–DTW | Greer to Detroit | 550 | 84.9% | -1.1 min | 2.7% |
| GSP–PHL | Greer to Philadelphia | 441 | 86.8% | -3.3 min | 2.0% |
| GSP–DEN | Greer to Denver | 366 | 79.0% | 1.9 min | 1.1% |
| GSP–HOU | Greer to Houston | 173 | 87.9% | -6.2 min | 1.7% |
| GSP–SFB | Greer to Sanford | 133 | 62.4% | 27.2 min | 0.8% |
| GSP–FLL | Greer to Fort Lauderdale | 131 | 41.2% | 54.4 min | 1.5% |
| GSP–PIE | Greer to St. Petersburg | 131 | 53.4% | 21.8 min | 0.0% |
The 17 busiest of 22 routes with reported flights. Routes with at least 10 flights a month have their own page.
Month by month
By scheduled departure hour
Among hours with at least 284 departures, 5 am to 6 am had the highest on-time share (92.8% of 642 flights) and 7 pm to 8 pm the lowest (61.4% of 798).
Delay causes
Cancellations by reported reason (381 in the period): air carrier 12%, weather 71%, national aviation system 17%, security 0%.
Checkpoint volumes
TSA publishes daily checkpoint passenger counts for the country as a whole, not for GSP on its own. The national series through September 2026 is on the checkpoint volumes page.
Questions and answers
How often do flights leave GSP on time?
79.0% of the 14,201 scheduled domestic departures in the 12 months to July 2026 left less than 15 minutes late; the national figure was 76.1%. 2.7% were cancelled.
How often do flights arrive at GSP on time?
74.2% of 14,203 scheduled arrivals were on time by the BTS definition, against 76.0% nationally.
Which airline has the highest on-time share at GSP?
Counting departures from GSP and whether they reached their destination on time, Delta Air Lines had the highest share (88.6% of 3,214 flights), then Southwest Airlines (85.9%) and United Airlines (78.5%). Carriers fly different routes at different hours, so the figures are not a like-for-like test.
What causes delays at GSP?
For departures from GSP that reached their destination 15 or more minutes late, carriers attributed the delay minutes as follows: late-arriving aircraft 43%, air carrier 30%, national aviation system 19%, extreme weather 8%, security 0%.
What time of day has the highest on-time share at GSP?
Departures scheduled from 5 am to 6 am local time left on time 92.8% of the time, the highest of any hour with enough flights to compare; 7 pm to 8 pm was lowest at 61.4%.
Is it getting better?
On-time departures for the 12 months to July 2026 were 79.0%, down 1.7 points on the previous 12 months (80.7%). The monthly chart shows each of the last 36 months, and each month has its own page.
Does this page show today's delays at GSP?
No. BTS publishes on-time records about two months after the month ends, so this page is a monthly history through July 2026. For live conditions use the FAA airport status service or your airline.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987 to present), monthly files August 2023 to July 2026; airport name from the BTS airport lookup table. US government works in the public domain. Domestic scheduled flights by reporting carriers only: international flights, charters and smaller carriers are not in the source. Totals and averages only; no individual flight or aircraft is identified. See the methodology; report processing errors through corrections.