St. Louis (STL) to San Antonio (SAT): On-Time Performance
Data through July 2026
The calendar drives reliability on STL–SAT. November 2025 flights landed on schedule 91% of the time, but June 2026 dropped to 56% — a gap of 35 points. Across the full period the route averages 80% on-time against a national 78%. Morning departures also hold up better than evening ones (88% vs 69%), which matters most in the rough months.
- On-time
- 80%
- arrived <15 min late
- Avg delay
- 12 min
- completed flights
- Cancelled
- 0.5%
- Flights/day
- 1.5
- last 12 months
- Duration
- 2h 15m
- scheduled
- Distance
- 786 mi
Monthly on-time trend
Best time to fly from STL to SAT
Aim for departures around 8 a.m. (90% on-time); avoid 5 p.m. departures (64%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 79% | 13 min |
| Tuesdaybest | 85% | 10 min |
| Wednesday | 83% | 9 min |
| Thursday | 79% | 15 min |
| Friday | 79% | 12 min |
| Saturday | 78% | 11 min |
| Sunday | 76% | 15 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 operations26%
- National airspace system10%
- Weather1%
Frequently asked questions
- How often are flights from STL to SAT delayed?
- 20% of STL–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 12 minutes.
- What is the best time of day to fly from STL to SAT?
- Departures around 8 a.m. have the best record (90% on-time), while departures around 5 p.m. have the worst (64%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from STL to SAT?
- The scheduled STL–SAT flight time averages 2h 15m over 786 miles. Actual arrival times vary — flights on this route land 15+ minutes late 20% of the time.
- How often are STL to SAT 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 STL to SAT?
- June 2026 was the roughest month in this dataset, with only 56% of arrivals on time. The best was November 2025 at 91%. If your dates are flexible, that 35-point gap is worth planning around.
Explore related pages
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Related guides
Based on 1,160 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.