Historical on-time performance
Houston to Ontario
1,334 miData through Dec 2025Source: US DOT · BTS
Flights on IAH–ONT arrive on time 68% of the time over the last 12 months.
On-time rate68%arrived within 15 min
p90 delay65 min1 in 10 flights is worse (tail risk)
Cancelled0.6%of scheduled flights
based on 338 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesOn-time68%Medianon timep9065 minCancel0.6%Flights338
Why flights run late
Delay causes
- Airline30%
- Weather3%
- Air traffic (NAS)8%
- Late aircraft59%
- 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 → ONT
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
Overnights are the most reliable time of day to fly this route — 67% on time.
- Overnights67% on time · p90 65 min · 480 flights
- Evenings55% on time · p90 90 min · 237 flights
- Middays52% on time · p90 70 min · 123 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 54% to 71% on time.
- Tuesdays71% on time · p90 55 min · 91 flights · limited
- Saturdays67% on time · p90 95 min · 106 flights · limited
- Fridays67% on time · p90 60 min · 169 flights · limited
- Thursdays65% on time · p90 60 min · 113 flights · limited
- Wednesdays56% on time · p90 65 min · 116 flights · limited
- Sundays55% on time · p90 110 min · 121 flights · limited
- Mondays54% on time · p90 75 min · 164 flights · limited
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