Historical on-time performance
Chicago to San Jose
1,838 miData through May 2026Source: US DOT · BTS
Flights on MDW–SJC arrive on time 69% of the time over the last 12 months.
On-time rate69%arrived within 15 min
p90 delay50 min1 in 10 flights is worse (tail risk)
Cancelled1.2%of scheduled flights
based on 512 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time69%Medianon timep9050 minCancel1.2%Flights512
Why flights run late
Delay causes
- Airline37%
- Weather1%
- Air traffic (NAS)11%
- Late aircraft51%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline17%
- Weather83%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 6 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 MDW → 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 — 83% on time.
- Mornings83% on time · p90 20 min · 572 flights
- Middays74% on time · p90 40 min · 213 flights
- Evenings66% on time · p90 60 min · 392 flights
- Afternoons57% on time · p90 65 min · 215 flights
- Overnights53% on time · p90 90 min · 246 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 64% to 73% on time.
- Saturdays73% on time · p90 40 min · 175 flights · limited
- Wednesdays73% on time · p90 40 min · 251 flights
- Fridays72% on time · p90 45 min · 260 flights
- Tuesdays71% on time · p90 55 min · 252 flights
- Thursdays68% on time · p90 50 min · 259 flights
- Mondays68% on time · p90 45 min · 257 flights
- Sundays64% on time · p90 85 min · 184 flights · limited
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