Historical on-time performance
Austin to Ontario
1,196 miData through Dec 2025Source: US DOT · BTS
Flights on AUS–ONT arrive on time 81% of the time over the last 12 months.
On-time rate81%arrived within 15 min
p90 delay30 min1 in 10 flights is worse (tail risk)
Cancelled0.0%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-time81%Medianon timep9030 minCancel0.0%Flights215
Why flights run late
Delay causes
- Airline24%
- Weather2%
- Air traffic (NAS)7%
- Late aircraft66%
- 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 AUS → ONT
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
Middays are the most reliable time of day to fly this route — 82% on time.
- Middays82% on time · p90 20 min · 168 flights · limited
- Afternoons71% on time · p90 40 min · 762 flights
- Overnights60% on time · p90 70 min · 57 flights · limited
- Evenings49% on time · p90 50 min · 91 flights · limited
Best day of week
Tuesdays are the most reliable day to fly this route — 82% on time.
- Tuesdays82% on time · p90 30 min · 157 flights · limited
- Wednesdays72% on time · p90 30 min · 157 flights · limited
- Saturdays71% on time · p90 45 min · 134 flights · limited
- Fridays70% on time · p90 55 min · 156 flights · limited
- Mondays69% on time · p90 40 min · 157 flights · limited
- Thursdays67% on time · p90 35 min · 155 flights · limited
- Sundays63% on time · p90 50 min · 163 flights · limited
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