Historical on-time performance
Ontario to Chicago
1,700 miData through May 2026Source: US DOT · BTS
Flights on ONT–ORD 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)
Cancelled0.4%of scheduled flights
based on 244 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesOn-time78%Medianon timep9030 minCancel0.4%Flights244
Why flights run late
Delay causes
- Airline47%
- Weather0%
- Air traffic (NAS)46%
- Late aircraft7%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline0%
- Weather100%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 1 cancellations with a reported cause (BTS reports causes from June 2003).
Over time
On-time trend
By season
On-time rate by month
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