Historical on-time performance
St. Louis to Houston
667 miData through May 2026Source: US DOT · BTS
Flights on STL–IAH arrive on time 80% of the time over the last 12 months.
On-time rate80%arrived within 15 min
p90 delay30 min1 in 10 flights is worse (tail risk)
Cancelled1.2%of scheduled flights
based on 324 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesOn-time80%Medianon timep9030 minCancel1.2%Flights324
Why flights run late
Delay causes
- Airline55%
- Weather4%
- Air traffic (NAS)17%
- Late aircraft25%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline0%
- Weather75%
- Air traffic (NAS)25%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 4 cancellations with a reported cause (BTS reports causes from June 2003).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly STL → IAH
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 60% to 83% on time.
- Mornings83% on time · p90 25 min · 1,101 flights
- Middays81% on time · p90 30 min · 107 flights · limited
- Afternoons67% on time · p90 75 min · 528 flights
- Evenings60% on time · p90 130 min · 201 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 74% to 79% on time.
- Tuesdays79% on time · p90 35 min · 273 flights
- Mondays77% on time · p90 60 min · 299 flights
- Wednesdays77% on time · p90 45 min · 275 flights
- Saturdays76% on time · p90 50 min · 247 flights
- Thursdays76% on time · p90 40 min · 280 flights
- Fridays75% on time · p90 55 min · 285 flights
- Sundays74% on time · p90 45 min · 278 flights
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