San Antonio (SAT) to Chicago (MDW): On-Time Performance
Data through July 2026
When you fly SAT to MDW matters as much as anything else about the booking: the route swung from 100% on-time in February 2025 to just 54% in March 2026. Across the full period the route averages 83% on-time against a national 78%.
- On-time
- 83%
- arrived <15 min late
- Avg delay
- 9 min
- completed flights
- Cancelled
- 0.8%
- Flights/day
- 1.8
- last 12 months
- Duration
- 2h 35m
- scheduled
- Distance
- 1,036 mi
Monthly on-time trend
Best time to fly from SAT to MDW
Aim for departures around 5 a.m. (96% on-time); avoid 3 p.m. departures (61%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 83% | 10 min |
| Tuesday | 87% | 9 min |
| Wednesday | 84% | 8 min |
| Thursday | 80% | 11 min |
| Friday | 85% | 9 min |
| Saturdaybest | 88% | 7 min |
| Sunday | 78% | 10 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft53%
- Airline operations23%
- National airspace system21%
- Weather3%
Frequently asked questions
- How often are flights from SAT to MDW delayed?
- 17% of SAT–MDW flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 9 minutes.
- What is the best time of day to fly from SAT to MDW?
- Departures around 5 a.m. have the best record (96% on-time), while departures around 3 p.m. have the worst (61%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SAT to MDW?
- The scheduled SAT–MDW flight time averages 2h 35m over 1,036 miles. Actual arrival times vary — flights on this route land 15+ minutes late 17% of the time.
- How often are SAT to MDW flights cancelled?
- 0.8% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from SAT to MDW?
- March 2026 was the roughest month in this dataset, with only 54% of arrivals on time. The best was February 2025 at 100%. If your dates are flexible, that 46-point gap is worth planning around.
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Based on 1,455 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.