Historical on-time performance
Ontario to Houston
1,345 miData through Dec 2025Source: US DOT · BTS
Flights on ONT–HOU arrive on time 80% of the time over the last 12 months.
On-time rate80%arrived within 15 min
p90 delay30 min1 in 10 flights is worse (tail risk)
Cancelled0.3%of scheduled flights
based on 305 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time80%Medianon timep9030 minCancel0.3%Flights305
Why flights run late
Delay causes
- Airline36%
- Weather0%
- Air traffic (NAS)10%
- Late aircraft54%
- 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 ONT → HOU
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
Mornings are the most reliable time of day to fly this route — 94% on time.
- Mornings94% on time · p90 5 min · 383 flights
- Middays79% on time · p90 30 min · 353 flights
- Afternoons55% on time · p90 65 min · 71 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 75% to 92% on time.
- Saturdays92% on time · p90 10 min · 106 flights · limited
- Tuesdays91% on time · p90 10 min · 117 flights · limited
- Wednesdays87% on time · p90 15 min · 117 flights · limited
- Sundays85% on time · p90 20 min · 119 flights · limited
- Mondays81% on time · p90 25 min · 118 flights · limited
- Thursdays78% on time · p90 25 min · 114 flights · limited
- Fridays75% on time · p90 35 min · 116 flights · limited
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