Historical on-time performance
Chicago to San Jose
1,829 miData through May 2026Source: US DOT · BTS
Flights on ORD–SJC arrive on time 61% of the time over the last 12 months.
On-time rate61%arrived within 15 min
p90 delay80 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-time61%Medianon timep9080 minCancel1.2%Flights244
Why flights run late
Delay causes
- Airline32%
- Weather5%
- Air traffic (NAS)9%
- Late aircraft53%
- 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 ORD → SJC
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 — 82% on time.
- Mornings82% on time · p90 20 min · 222 flights
- Overnights70% on time · p90 80 min · 128 flights · limited
- Evenings65% on time · p90 80 min · 565 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 66% to 75% on time.
- Mondays75% on time · p90 40 min · 142 flights · limited
- Saturdays74% on time · p90 55 min · 133 flights · limited
- Thursdays73% on time · p90 60 min · 140 flights · limited
- Wednesdays71% on time · p90 60 min · 132 flights · limited
- Tuesdays70% on time · p90 65 min · 130 flights · limited
- Fridays67% on time · p90 45 min · 144 flights · limited
- Sundays66% on time · p90 80 min · 137 flights · limited
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