Historical on-time performance
Ontario to Austin
1,196 miData through Dec 2025Source: US DOT · BTS
Flights on ONT–AUS arrive on time 83% of the time over the last 12 months.
On-time rate83%arrived within 15 min
p90 delay20 min1 in 10 flights is worse (tail risk)
Cancelled0.9%of scheduled flights
based on 215 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time83%Medianon timep9020 minCancel0.9%Flights215
Why flights run late
Delay causes
- Airline22%
- Weather0%
- Air traffic (NAS)18%
- Late aircraft59%
- Security1%
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 → AUS
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 84% to 87% on time.
- Mornings87% on time · p90 15 min · 491 flights
- Middays84% on time · p90 20 min · 539 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 83% to 90% on time.
- Saturdays90% on time · p90 10 min · 134 flights · limited
- Thursdays87% on time · p90 15 min · 155 flights · limited
- Tuesdays85% on time · p90 15 min · 157 flights · limited
- Wednesdays85% on time · p90 15 min · 157 flights · limited
- Fridays85% on time · p90 15 min · 156 flights · limited
- Sundays84% on time · p90 30 min · 163 flights · limited
- Mondays83% on time · p90 25 min · 157 flights · limited
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