Historical on-time performance
Chicago to San Antonio
1,036 miData through Dec 2025Source: US DOT · BTS
Flights on MDW–SAT arrive on time 78% of the time over the last 12 months.
On-time rate78%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.7%of scheduled flights
based on 734 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time78%Medianon timep9040 minCancel0.7%Flights734
Why flights run late
Delay causes
- Airline28%
- Weather2%
- Air traffic (NAS)14%
- Late aircraft55%
- 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 → SAT
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 63% to 85% on time.
- Mornings85% on time · p90 20 min · 918 flights
- Middays80% on time · p90 30 min · 155 flights · limited
- Afternoons76% on time · p90 55 min · 148 flights · limited
- Evenings70% on time · p90 60 min · 211 flights
- Overnights63% on time · p90 55 min · 680 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 72% to 82% on time.
- Wednesdays82% on time · p90 30 min · 305 flights
- Saturdays77% on time · p90 35 min · 250 flights
- Mondays76% on time · p90 35 min · 323 flights
- Tuesdays75% on time · p90 40 min · 305 flights
- Thursdays75% on time · p90 45 min · 318 flights
- Sundays73% on time · p90 50 min · 291 flights
- Fridays72% on time · p90 45 min · 320 flights
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