Historical on-time performance
Houston to St. Louis
667 miData through Dec 2025Source: US DOT · BTS
Flights on IAH–STL arrive on time 71% of the time over the last 12 months.
On-time rate71%arrived within 15 min
p90 delay55 min1 in 10 flights is worse (tail risk)
Cancelled1.0%of scheduled flights
based on 499 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- SkyWest AirlinesOn-time75%Medianon timep9055 minCancel0.0%Flights56
- United AirlinesOn-time71%Medianon timep9055 minCancel1.1%Flights443
Why flights run late
Delay causes
- Airline35%
- Weather11%
- Air traffic (NAS)10%
- Late aircraft44%
- Security0%
Most delay minutes here are attributed to Late aircraft.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly IAH → STL
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 64% to 79% on time.
- Middays79% on time · p90 40 min · 136 flights · limited
- Mornings79% on time · p90 45 min · 104 flights · limited
- Afternoons73% on time · p90 65 min · 660 flights
- Evenings73% on time · p90 50 min · 333 flights
- Overnights64% on time · p90 75 min · 637 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 66% to 76% on time.
- Tuesdays76% on time · p90 35 min · 258 flights
- Saturdays72% on time · p90 70 min · 231 flights
- Wednesdays72% on time · p90 55 min · 278 flights
- Sundays72% on time · p90 55 min · 288 flights
- Fridays71% on time · p90 75 min · 261 flights
- Mondays67% on time · p90 75 min · 275 flights
- Thursdays66% on time · p90 75 min · 279 flights
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