San Antonio (SAT) to St. Louis (STL): On-Time Performance
Data through July 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 67% in June 2026. 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 68%), 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 8m
- 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 (69%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 87% | 9 min |
| Tuesdaybest | 93% | 4 min |
| Wednesday | 91% | 4 min |
| Thursday | 83% | 8 min |
| Friday | 85% | 9 min |
| Saturday | 88% | 6 min |
| Sunday | 80% | 12 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft61%
- Airline operations28%
- National airspace system8%
- Weather3%
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 2024-07 and 2026-07. 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 (69%). 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 8m 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 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from SAT to STL?
- June 2026 was the roughest month in this dataset, with only 67% of arrivals on time. The best was February 2025 at 97%. If your dates are flexible, that 30-point gap is worth planning around.
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Based on 1,161 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.