Historical on-time performance
San Jose to Chicago
1,829 miData through May 2026Source: US DOT · BTS
Flights on SJC–ORD arrive on time 90% of the time over the last 12 months.
On-time rate90%arrived within 15 min
p90 delay10 min1 in 10 flights is worse (tail risk)
Cancelled1.2%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-time90%Medianon timep9010 minCancel1.2%Flights244
Why flights run late
Delay causes
- Airline23%
- Weather0%
- Air traffic (NAS)35%
- Late aircraft41%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline33%
- Weather67%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 3 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 SJC → ORD
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 89% to 92% on time.
- Mornings92% on time · p90 10 min · 844 flights
- Overnights89% on time · p90 10 min · 101 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 87% to 94% on time.
- Sundays94% on time · p90 10 min · 134 flights · limited
- Wednesdays93% on time · p90 5 min · 132 flights · limited
- Thursdays93% on time · p90 5 min · 142 flights · limited
- Mondays92% on time · p90 10 min · 142 flights · limited
- Fridays91% on time · p90 10 min · 145 flights · limited
- Tuesdays89% on time · p90 15 min · 130 flights · limited
- Saturdays87% on time · p90 10 min · 135 flights · limited
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