Historical on-time performance
Chicago to San Jose
1,838 miData through Dec 2025Source: US DOT · BTS
Flights on MDW–SJC arrive on time 76% of the time over the last 12 months.
On-time rate76%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.8%of scheduled flights
based on 509 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time76%Medianon timep9040 minCancel0.8%Flights509
Why flights run late
Delay causes
- Airline35%
- Weather3%
- Air traffic (NAS)9%
- Late aircraft54%
- Security0%
Most delay minutes here are attributed to Late aircraft.
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 (2023-01 .. 2025-12).
Best time of day
Mornings are the most reliable time of day to fly this route — 84% on time.
- Mornings84% on time · p90 20 min · 592 flights
- Middays74% on time · p90 40 min · 247 flights
- Evenings66% on time · p90 60 min · 383 flights
- Afternoons55% on time · p90 65 min · 218 flights
- Overnights55% on time · p90 90 min · 188 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 64% to 75% on time.
- Fridays75% on time · p90 45 min · 256 flights
- Wednesdays73% on time · p90 40 min · 257 flights
- Saturdays72% on time · p90 40 min · 174 flights · limited
- Tuesdays72% on time · p90 50 min · 257 flights
- Mondays70% on time · p90 45 min · 256 flights
- Thursdays69% on time · p90 45 min · 255 flights
- Sundays64% on time · p90 85 min · 173 flights · limited
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