Best Time to Fly GSP to ATL: On-Time Stats by Hour & Airline
Greenville-Spartanburg International → Hartsfield-Jackson Atlanta International
Data through July 2026 · Last updated October 18, 2026
2,819 flights were scheduled from Greer (GSP) to Atlanta (ATL) in the last 12 months, and 90.2% of those that flew arrived on time, 12.6 points above the US average of 77.6%.
Delta Air Lines was the only reporting airline with regular flights on this route.
April has been the best month (94% on time) and Sunday the weakest day of the week (85%).
1.6% of flights were cancelled, versus 1.8% nationally.
GSP to ATL 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 | 90.2% | 85 min | 1.6% | 2,819 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly GSP to ATL
On-time arrival % by scheduled departure hour (local time), 5,687 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 96.2% | 1.4% | 696 |
| 6am–7am | 93.9% | 1.2% | 499 |
| 7am–8am | 90.9% | 1.4% | 433 |
| 8am–9am | 93.1% | 2.1% | 340 |
| 9am–10am | 89.5% | 2.3% | 88 |
| 10am–11am | 94.2% | 0.8% | 603 |
| 11am–12pm | 88.2% | 1.1% | 472 |
| 12pm–1pm | 93.0% | 0.7% | 287 |
| 1pm–2pm | 87.6% | 1.4% | 287 |
| 2pm–3pm | 87.9% | 0.5% | 375 |
| 3pm–4pm | 84.5% | 1.7% | 355 |
| 4pm–5pm | 87.4% | 1.6% | 185 |
| 5pm–6pm | 81.6% | 1.6% | 550 |
| 6pm–7pm | 78.4% | 0.7% | 140 |
| 7pm–8pm | 82.2% | 0.9% | 335 |
| 8pm–9pm | 81.0% | 0.0% | 42 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on GSP to ATL
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) | 89.0% | -1.5 pts | 0.0% | 109 |
| Christmas & New Year (Dec 20 - Jan 3) | 88.8% | -1.8 pts | 0.6% | 179 |
| Summer peak (Jun 15 - Aug 15) | 85.3% | -5.2 pts | 1.1% | 1,026 |
| All other days | 90.5% | — | 1.4% | 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).