Best Time to Fly ATL to SAT: On-Time Stats by Hour & Airline
Hartsfield-Jackson Atlanta International → San Antonio International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 81.3% of Atlanta (ATL) to San Antonio (SAT) flights arrived on time (3,000 scheduled flights). That is 3.7 points above the national average of 77.6%.
Among 3 airlines, Southwest Airlines led with 81.6% on time and Frontier Airlines was last with 74.7%.
Over 24 months, Wednesday was the most reliable day (85% on time) and July the worst month (68%).
The cancellation rate was 1.6% (US average 1.8%).
ATL to SAT 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 |
|---|---|---|---|---|
| Southwest Airlines | 81.6% | 49 min | 0.3% | 305 |
| Delta Air Lines | 81.5% | 55 min | 1.8% | 2,612 |
| Frontier Airlines | 74.7% | 98 min | 0.0% | 83 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ATL to SAT
On-time arrival % by scheduled departure hour (local time), 6,042 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | Limited data | 1 | |
| 7am–8am | Limited data | 28 | |
| 8am–9am | 89.2% | 2.1% | 789 |
| 9am–10am | 86.7% | 0.7% | 552 |
| 10am–11am | 83.0% | 0.8% | 130 |
| 11am–12pm | 82.0% | 1.3% | 554 |
| 12pm–1pm | 79.4% | 0.5% | 219 |
| 1pm–2pm | 78.5% | 1.0% | 491 |
| 2pm–3pm | 81.5% | 0.2% | 445 |
| 3pm–4pm | 73.2% | 1.1% | 703 |
| 4pm–5pm | 79.7% | 1.1% | 189 |
| 5pm–6pm | Limited data | 16 | |
| 6pm–7pm | 71.6% | 0.7% | 446 |
| 7pm–8pm | 78.3% | 2.1% | 141 |
| 8pm–9pm | 68.1% | 1.4% | 441 |
| 9pm–10pm | 81.5% | 1.3% | 154 |
| 10pm–11pm | 77.2% | 2.2% | 507 |
| 11pm–12am | 78.3% | 0.4% | 236 |
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 SAT
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) | 75.7% | -5.3 pts | 0.0% | 111 |
| Christmas & New Year (Dec 20 - Jan 3) | 78.1% | -2.9 pts | 1.8% | 219 |
| Summer peak (Jun 15 - Aug 15) | 73.4% | -7.6 pts | 1.8% | 1,077 |
| All other days | 81.0% | — | 1.1% | 4,635 |
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).