Historical on-time performance
Ontario to Houston
Flights on ONT–IAH arrive on time 86% of the time over the last 12 months.
based on 367 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Not enough comparable data to name a most-on-time carrier — low-data carriers aren't ranked.
- United AirlinesOn-time87%Medianon timep9015 minCancel0.6%Flights337
- Frontier AirlinesOn-time73%Medianon timep9050 minCancel0.0%Flights30
Why flights run late
Delay causes
- Airline45%
- Weather0%
- Air traffic (NAS)23%
- Late aircraft32%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline50%
- Weather50%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 2 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 ONT → IAH
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Mornings are the most reliable time of day to fly this route — 87% on time.
- Mornings87% on time · p90 15 min · 767 flights
- Middays73% on time · p90 70 min · 131 flights · limited
- Afternoons57% on time · p90 70 min · 155 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 73% to 91% on time.
- Tuesdays91% on time · p90 10 min · 116 flights · limited
- Saturdays89% on time · p90 10 min · 132 flights · limited
- Thursdays86% on time · p90 20 min · 142 flights · limited
- Sundays82% on time · p90 25 min · 151 flights · limited
- Fridays76% on time · p90 45 min · 210 flights
- Wednesdays76% on time · p90 40 min · 139 flights · limited
- Mondays73% on time · p90 45 min · 204 flights
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