St. Louis (STL) to Houston (HOU): On-Time Performance
Data through July 2026
The calendar drives reliability on STL–HOU. February 2026 flights landed on schedule 95% of the time, but July 2024 dropped to 62% — a gap of 33 points. Across the full period the route averages 79% on-time against a national 78%. Morning departures also hold up better than evening ones (91% vs 69%), which matters most in the rough months.
- On-time
- 79%
- arrived <15 min late
- Avg delay
- 12 min
- completed flights
- Cancelled
- 0.8%
- Flights/day
- 4.2
- last 12 months
- Duration
- 2h 9m
- scheduled
- Distance
- 687 mi
Monthly on-time trend
Best time to fly from STL to HOU
Aim for departures around 5 a.m. (94% on-time); avoid 7 p.m. departures (61%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 75% | 15 min |
| Tuesday | 84% | 9 min |
| Wednesdaybest | 86% | 8 min |
| Thursday | 79% | 12 min |
| Friday | 81% | 12 min |
| Saturday | 78% | 13 min |
| Sunday | 75% | 17 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft55%
- Airline operations26%
- National airspace system15%
- Weather3%
Frequently asked questions
- How often are flights from STL to HOU delayed?
- 21% of STL–HOU 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 HOU?
- Departures around 5 a.m. have the best record (94% on-time), while departures around 7 p.m. have the worst (61%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from STL to HOU?
- The scheduled STL–HOU flight time averages 2h 9m over 687 miles. Actual arrival times vary — flights on this route land 15+ minutes late 21% of the time.
- How often are STL to HOU flights cancelled?
- 0.8% 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 HOU?
- July 2024 was the roughest month in this dataset, with only 62% of arrivals on time. The best was February 2026 at 95%. If your dates are flexible, that 33-point gap is worth planning around.
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Based on 3,218 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.