Best Time to Fly SAT to ATL: On-Time Stats by Hour & Airline
San Antonio International → Hartsfield-Jackson Atlanta International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 85.9% of San Antonio (SAT) to Atlanta (ATL) flights arrived on time (2,999 scheduled flights). That is 8.2 points above the national average of 77.6%.
Delta Air Lines was the most punctual of the 3 airlines on the route at 87.4%, while Frontier Airlines trailed at 65.8%.
September has been the best month (93% on time) and Sunday the weakest day of the week (80%).
1.7% of flights were cancelled, versus 1.8% nationally.
SAT 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 | 87.4% | 77 min | 1.9% | 2,611 |
| Southwest Airlines | 78.3% | 44 min | 0.3% | 305 |
| Frontier Airlines | 65.8% | 105 min | 0.0% | 83 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SAT to ATL
On-time arrival % by scheduled departure hour (local time), 6,069 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 92.3% | 1.7% | 766 |
| 6am–7am | 93.5% | 1.4% | 559 |
| 7am–8am | 90.2% | 1.5% | 455 |
| 8am–9am | 92.4% | 0.8% | 401 |
| 9am–10am | Limited data | 16 | |
| 10am–11am | 89.2% | 1.8% | 552 |
| 11am–12pm | 86.5% | 1.1% | 278 |
| 12pm–1pm | 80.6% | 0.9% | 560 |
| 1pm–2pm | 77.1% | 1.9% | 428 |
| 2pm–3pm | 78.5% | 0.4% | 501 |
| 3pm–4pm | 69.7% | 0.7% | 147 |
| 4pm–5pm | 73.4% | 0.8% | 495 |
| 5pm–6pm | 82.0% | 1.6% | 321 |
| 6pm–7pm | 78.7% | 1.6% | 562 |
| 8pm–9pm | Limited data | 28 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SAT 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) | 89.2% | +3.3 pts | 0.0% | 111 |
| Christmas & New Year (Dec 20 - Jan 3) | 82.3% | -3.5 pts | 1.8% | 219 |
| Summer peak (Jun 15 - Aug 15) | 78.0% | -7.8 pts | 1.9% | 1,077 |
| All other days | 85.9% | — | 1.1% | 4,662 |
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).