Historical on-time performance
Austin to Ontario
1,196 miData through May 2026Source: US DOT · BTS
Flights on AUS–ONT arrive on time 78% of the time over the last 12 months.
On-time rate78%arrived within 15 min
p90 delay30 min1 in 10 flights is worse (tail risk)
Cancelled0.0%of scheduled flights
based on 123 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time78%Medianon timep9030 minCancel0.0%Flights123
Why flights run late
Delay causes
- Airline19%
- Weather3%
- Air traffic (NAS)10%
- Late aircraft67%
- Security1%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline67%
- Weather33%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 12 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 AUS → ONT
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Middays are the most reliable time of day to fly this route — 83% on time.
- Middays83% on time · p90 20 min · 197 flights · limited
- Afternoons72% on time · p90 35 min · 708 flights
- Evenings55% on time · p90 50 min · 109 flights · limited
Best day of week
Tuesdays are the most reliable day to fly this route — 85% on time.
- Tuesdays85% on time · p90 25 min · 156 flights · limited
- Wednesdays74% on time · p90 25 min · 156 flights · limited
- Mondays72% on time · p90 40 min · 156 flights · limited
- Fridays71% on time · p90 45 min · 157 flights · limited
- Saturdays70% on time · p90 50 min · 128 flights · limited
- Thursdays70% on time · p90 30 min · 156 flights · limited
- Sundays61% on time · p90 60 min · 163 flights · limited
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