Historical on-time performance
San Jose to Chicago
1,838 miData through May 2026Source: US DOT · BTS
Flights on SJC–MDW arrive on time 82% of the time over the last 12 months.
On-time rate82%arrived within 15 min
p90 delay25 min1 in 10 flights is worse (tail risk)
Cancelled0.4%of scheduled flights
based on 517 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time82%Medianon timep9025 minCancel0.4%Flights517
Why flights run late
Delay causes
- Airline45%
- Weather1%
- Air traffic (NAS)17%
- Late aircraft37%
- 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 2 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 → MDW
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 — 91% on time.
- Mornings91% on time · p90 10 min · 881 flights
- Middays74% on time · p90 30 min · 532 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 80% to 91% on time.
- Saturdays91% on time · p90 10 min · 175 flights · limited
- Sundays89% on time · p90 15 min · 184 flights · limited
- Wednesdays85% on time · p90 20 min · 251 flights
- Thursdays84% on time · p90 20 min · 258 flights
- Tuesdays83% on time · p90 25 min · 252 flights
- Fridays82% on time · p90 25 min · 259 flights
- Mondays80% on time · p90 20 min · 255 flights
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