Historical on-time performance
San Antonio to Chicago
1,036 miData through Dec 2025Source: US DOT · BTS
Flights on SAT–MDW arrive on time 85% of the time over the last 12 months.
On-time rate85%arrived within 15 min
p90 delay20 min1 in 10 flights is worse (tail risk)
Cancelled0.8%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-time85%Medianon timep9020 minCancel0.8%Flights734
Why flights run late
Delay causes
- Airline26%
- Weather3%
- Air traffic (NAS)19%
- Late aircraft52%
- 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 SAT → MDW
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 78% to 92% on time.
- Mornings92% on time · p90 10 min · 1,026 flights
- Middays89% on time · p90 15 min · 130 flights · limited
- Evenings79% on time · p90 40 min · 100 flights · limited
- Afternoons78% on time · p90 30 min · 874 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 81% to 90% on time.
- Saturdays90% on time · p90 10 min · 250 flights
- Tuesdays89% on time · p90 15 min · 314 flights
- Mondays86% on time · p90 15 min · 323 flights
- Wednesdays86% on time · p90 15 min · 314 flights
- Sundays84% on time · p90 20 min · 291 flights
- Fridays84% on time · p90 20 min · 320 flights
- Thursdays81% on time · p90 25 min · 318 flights
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