Historical on-time performance
Houston to Ontario
Flights on IAH–ONT arrive on time 74% 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.
- Frontier AirlinesOn-time87%Medianon timep9020 minCancel0.0%Flights30
- United AirlinesOn-time73%Medianon timep9065 minCancel0.3%Flights337
Why flights run late
Delay causes
- Airline29%
- Weather2%
- Air traffic (NAS)7%
- Late aircraft61%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline0%
- Weather100%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 1 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 IAH → ONT
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Overnights are the most reliable time of day to fly this route — 72% on time.
- Overnights72% on time · p90 60 min · 628 flights
- Middays58% on time · p90 70 min · 142 flights · limited
- Evenings55% on time · p90 95 min · 243 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 60% to 75% on time.
- Tuesdays75% on time · p90 45 min · 116 flights · limited
- Fridays71% on time · p90 55 min · 211 flights
- Thursdays70% on time · p90 60 min · 142 flights · limited
- Saturdays67% on time · p90 80 min · 132 flights · limited
- Sundays63% on time · p90 85 min · 151 flights · limited
- Wednesdays62% on time · p90 65 min · 141 flights · limited
- Mondays60% on time · p90 70 min · 204 flights
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