Historical on-time performance
San Jose to Chicago
1,838 miData through Dec 2025Source: US DOT · BTS
Flights on SJC–MDW arrive on time 84% of the time over the last 12 months.
On-time rate84%arrived within 15 min
p90 delay20 min1 in 10 flights is worse (tail risk)
Cancelled0.2%of scheduled flights
based on 491 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time84%Medianon timep9020 minCancel0.2%Flights491
Why flights run late
Delay causes
- Airline46%
- Weather0%
- Air traffic (NAS)20%
- Late aircraft34%
- Security0%
Most delay minutes here are attributed to Airline.
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 (2023-01 .. 2025-12).
Best time of day
Mornings are the most reliable time of day to fly this route — 92% on time.
- Mornings92% on time · p90 10 min · 973 flights
- Middays77% on time · p90 25 min · 518 flights
- Evenings73% on time · p90 55 min · 92 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 81% to 91% on time.
- Saturdays91% on time · p90 10 min · 174 flights · limited
- Sundays90% on time · p90 10 min · 173 flights · limited
- Wednesdays86% on time · p90 15 min · 257 flights
- Tuesdays85% on time · p90 25 min · 257 flights
- Thursdays85% on time · p90 20 min · 254 flights
- Mondays82% on time · p90 20 min · 254 flights
- Fridays81% on time · p90 20 min · 255 flights
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