Best Time to Fly ATL to GSP: On-Time Stats by Hour & Airline
Hartsfield-Jackson Atlanta International → Greenville-Spartanburg International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 83.9% of Atlanta (ATL) to Greer (GSP) flights arrived on time (2,818 scheduled flights). That is 6.2 points above the national average of 77.6%.
Delta Air Lines was the only reporting airline with regular flights on this route.
Over 24 months, Wednesday was the most reliable day (87% on time) and July the worst month (74%).
The cancellation rate was 1.6% (US average 1.8%).
ATL to GSP on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Lines | 83.9% | 58 min | 1.6% | 2,818 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ATL to GSP
On-time arrival % by scheduled departure hour (local time), 5,687 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | Limited data | 1 | |
| 8am–9am | 92.3% | 1.1% | 661 |
| 9am–10am | 91.0% | 0.7% | 302 |
| 10am–11am | 87.8% | 1.0% | 406 |
| 11am–12pm | 93.7% | 1.2% | 240 |
| 12pm–1pm | 88.0% | 0.6% | 359 |
| 1pm–2pm | 84.3% | 1.7% | 479 |
| 2pm–3pm | 87.4% | 2.9% | 172 |
| 3pm–4pm | 78.1% | 0.9% | 539 |
| 4pm–5pm | 81.5% | 1.2% | 164 |
| 5pm–6pm | 77.4% | 1.5% | 269 |
| 6pm–7pm | 79.4% | 0.5% | 409 |
| 7pm–8pm | 77.7% | 1.6% | 433 |
| 8pm–9pm | 75.7% | 1.7% | 289 |
| 9pm–10pm | 72.3% | 1.2% | 252 |
| 10pm–11pm | 81.5% | 1.8% | 573 |
| 11pm–12am | 71.7% | 0.7% | 139 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on ATL to GSP
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 84.3% | -0.3 pts | 0.0% | 109 |
| Christmas & New Year (Dec 20 - Jan 3) | 82.6% | -2.0 pts | 0.6% | 179 |
| Summer peak (Jun 15 - Aug 15) | 77.0% | -7.6 pts | 1.1% | 1,026 |
| All other days | 84.6% | — | 1.3% | 4,373 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).