Historical on-time performance
St. Louis to Houston
668 miData through Dec 2025Source: US DOT · BTS
Flights on STL–IAH arrive on time 77% of the time over the last 12 months.
On-time rate77%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled1.6%of scheduled flights
based on 502 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-time77%Medianon timep9070 minCancel0.0%Flights56
- United AirlinesOn-time77%Medianon timep9040 minCancel1.8%Flights446
Why flights run late
Delay causes
- Airline34%
- Weather5%
- Air traffic (NAS)32%
- Late aircraft29%
- Security0%
Most delay minutes here are attributed to Airline.
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 (2023-01 .. 2025-12).
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 · 1,051 flights
- Middays81% on time · p90 30 min · 106 flights · limited
- Afternoons68% on time · p90 75 min · 515 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.
- Saturdays79% on time · p90 45 min · 232 flights
- Tuesdays78% on time · p90 40 min · 267 flights
- Thursdays76% on time · p90 35 min · 270 flights
- Wednesdays76% on time · p90 45 min · 268 flights
- Mondays76% on time · p90 70 min · 292 flights
- Fridays75% on time · p90 55 min · 275 flights
- Sundays74% on time · p90 55 min · 269 flights
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