Historical on-time performance
Oakland to Ontario
362 miData through May 2026Source: US DOT · BTS
Flights on OAK–ONT arrive on time 83% of the time over the last 12 months.
On-time rate83%arrived within 15 min
p90 delay30 min1 in 10 flights is worse (tail risk)
Cancelled0.4%of scheduled flights
based on 1,512 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 timep9030 minCancel0.4%Flights1,512
Why flights run late
Delay causes
- Airline41%
- Weather0%
- Air traffic (NAS)5%
- Late aircraft55%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline17%
- Weather17%
- Air traffic (NAS)67%
- Security0%
Most cancellations here are attributed to Air traffic (NAS). Shares are among 6 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 OAK → ONT
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Mornings are the most reliable time of day to fly this route — 95% on time.
- Mornings95% on time · p90 on time · 1,402 flights
- Middays88% on time · p90 20 min · 1,135 flights
- Afternoons79% on time · p90 35 min · 584 flights
- Evenings78% on time · p90 35 min · 948 flights
- Overnights68% on time · p90 60 min · 621 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 79% to 90% on time.
- Saturdays90% on time · p90 10 min · 493 flights
- Tuesdays90% on time · p90 15 min · 646 flights
- Wednesdays89% on time · p90 15 min · 641 flights
- Mondays84% on time · p90 20 min · 729 flights
- Sundays83% on time · p90 25 min · 709 flights
- Thursdays80% on time · p90 35 min · 731 flights
- Fridays79% on time · p90 40 min · 741 flights
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