San Antonio (SAT) to St. Louis (STL): On-Time Performance
Data through May 2026
When you fly SAT to STL matters as much as anything else about the booking: the route swung from 97% on-time in February 2025 to just 75% in July 2024. Across the full period the route averages 87% on-time against a national 78%. Morning departures also hold up better than evening ones (95% vs 69%), which matters most in the rough months.
- On-time
- 87%
- arrived <15 min late
- Avg delay
- 7 min
- completed flights
- Cancelled
- 0.5%
- Flights/day
- 1.5
- last 12 months
- Duration
- 2h 7m
- scheduled
- Distance
- 786 mi
Monthly on-time trend
Best time to fly from SAT to STL
Aim for departures around 6 a.m. (98% on-time); avoid 5 p.m. departures (70%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 89% | 9 min |
| Tuesdaybest | 92% | 5 min |
| Wednesday | 90% | 4 min |
| Thursday | 85% | 9 min |
| Friday | 86% | 9 min |
| Saturday | 89% | 4 min |
| Sunday | 81% | 11 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft62%
- Airline operations28%
- National airspace system9%
- Weather2%
Frequently asked questions
- How often are flights from SAT to STL delayed?
- 13% of SAT–STL 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 7 minutes.
- What is the best time of day to fly from SAT to STL?
- Departures around 6 a.m. have the best record (98% on-time), while departures around 5 p.m. have the worst (70%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SAT to STL?
- The scheduled SAT–STL flight time averages 2h 7m over 786 miles. Actual arrival times vary — flights on this route land 15+ minutes late 13% of the time.
- How often are SAT to STL flights cancelled?
- 0.5% 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 SAT to STL?
- July 2024 was the roughest month in this dataset, with only 75% of arrivals on time. The best was February 2025 at 97%. If your dates are flexible, that 23-point gap is worth planning around.
Explore related pages
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Based on 1,106 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.