Atlanta (ATL) to San Antonio (SAT): On-Time Performance
Data through July 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 78% 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
- 78%
- arrived <15 min late
- Avg delay
- 14 min
- completed flights
- Cancelled
- 1.4%
- Flights/day
- 8.2
- last 12 months
- Duration
- 2h 32m
- scheduled
- Distance
- 874 mi
Best airline from ATL to SAT
4 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlinesmost reliable | 81% | 11 min | 0.4% | 918 |
| Delta Air Lines | 78% | 13 min | 1.6% | 5,200 |
| 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. (89% on-time); avoid 8 p.m. departures (67%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 76% | 17 min |
| Tuesday | 81% | 12 min |
| Wednesdaybest | 84% | 8 min |
| Thursday | 78% | 12 min |
| Friday | 78% | 13 min |
| Saturday | 79% | 13 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 operations45%
- National airspace system17%
- Weather6%
Frequently asked questions
- How often are flights from ATL to SAT delayed?
- 22% of ATL–SAT flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 14 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 918 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 (89% on-time), while departures around 8 p.m. have the worst (67%). 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 22% of the time.
- How often are ATL to SAT flights cancelled?
- 1.4% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, 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.
Explore related pages
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Related guides
Based on 6,314 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.