Historical on-time performance
St. Thomas to Houston
2,070 miData through May 2026Source: US DOT · BTS
Flights on STT–IAH arrive on time 79% of the time over the last 12 months.
On-time rate79%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled0.0%of scheduled flights
based on 92 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesOn-time79%Medianon timep9035 minCancel0.0%Flights92
Why flights run late
Delay causes
- Airline9%
- Weather0%
- Air traffic (NAS)39%
- Late aircraft52%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline75%
- Weather0%
- Air traffic (NAS)25%
- Security0%
Most cancellations here are attributed to Airline. 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 STT → 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 76% to 79% on time.
- Middays79% on time · p90 30 min · 317 flights
- Afternoons76% on time · p90 40 min · 136 flights · limited
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