Historical on-time performance
Chicago to San Diego
1,728 miData through Dec 2025Source: US DOT · BTS
Flights on MDW–SAN arrive on time 76% of the time over the last 12 months.
On-time rate76%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled0.6%of scheduled flights
based on 1,004 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 timep9035 minCancel0.6%Flights1,004
Why flights run late
Delay causes
- Airline38%
- Weather4%
- Air traffic (NAS)22%
- Late aircraft35%
- Security1%
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 MDW → SAN
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 — 85% on time.
- Mornings85% on time · p90 20 min · 1,149 flights
- Middays76% on time · p90 40 min · 754 flights
- Evenings70% on time · p90 40 min · 222 flights
- Afternoons67% on time · p90 45 min · 364 flights
- Overnights58% on time · p90 60 min · 681 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 71% to 77% on time.
- Wednesdays77% on time · p90 40 min · 447 flights
- Saturdays76% on time · p90 35 min · 387 flights
- Fridays74% on time · p90 40 min · 481 flights
- Thursdays74% on time · p90 35 min · 478 flights
- Mondays73% on time · p90 35 min · 483 flights
- Tuesdays73% on time · p90 35 min · 446 flights
- Sundays71% on time · p90 40 min · 448 flights
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