Atlanta (ATL) to San Antonio (SAT): On-Time Performance
Data through May 2026
The calendar drives reliability on ATL–SAT. October 2024 flights landed on schedule 92% of the time, but July 2024 dropped to 58% — a gap of 34 points. Across the full period the route averages 79% on-time against a national 78%. Morning departures also hold up better than evening ones (86% vs 73%), which matters most in the rough months.
- On-time
- 79%
- arrived <15 min late
- Avg delay
- 13 min
- completed flights
- Cancelled
- 1.3%
- Flights/day
- 8.4
- last 12 months
- Duration
- 2h 32m
- scheduled
- Distance
- 874 mi
Best airline from ATL to SAT
4 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlinesmost reliable | 81% | 11 min | 0.4% | 944 |
| Delta Air Lines | 79% | 13 min | 1.4% | 4,947 |
| Spirit Airlines | 75% | 15 min | 0.0% | 91 |
| Frontier Airlines | 66% | 35 min | 1.9% | 105 |
Monthly on-time trend
Best time to fly from ATL to SAT
Aim for departures around 8 a.m. (88% on-time); avoid 8 p.m. departures (68%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 77% | 16 min |
| Tuesday | 82% | 12 min |
| Wednesdaybest | 83% | 8 min |
| Thursday | 79% | 12 min |
| Friday | 79% | 12 min |
| Saturday | 79% | 12 min |
| Sunday | 73% | 20 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft33%
- Airline operations44%
- National airspace system17%
- Weather6%
Frequently asked questions
- How often are flights from ATL to SAT delayed?
- 21% of ATL–SAT flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 13 minutes.
- Which airline is most reliable from ATL to SAT?
- Southwest Airlines has the best on-time record on this route at 81%, based on 944 flights. 4 airlines flew ATL–SAT frequently enough to compare in this period.
- What is the best time of day to fly from ATL to SAT?
- Departures around 8 a.m. have the best record (88% on-time), while departures around 8 p.m. have the worst (68%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from ATL to SAT?
- The scheduled ATL–SAT flight time averages 2h 32m over 874 miles. Actual arrival times vary — flights on this route land 15+ minutes late 21% of the time.
- How often are ATL to SAT flights cancelled?
- 1.3% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from ATL to SAT?
- July 2024 was the roughest month in this dataset, with only 58% of arrivals on time. The best was October 2024 at 92%. If your dates are flexible, that 34-point gap is worth planning around.
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Based on 6,087 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.