Chicago (MDW) to San Antonio (SAT): On-Time Performance
Data through July 2026
Chicago (MDW) to San Antonio (SAT) effectively runs on two schedules. In February 2026, 96% of arrivals were on time; in July 2024 that fell to 52% — a 45-point seasonal swing. Across the full period the route averages 77% on-time against a national 78%. Morning departures also hold up better than evening ones (85% vs 68%), which matters most in the rough months.
- On-time
- 77%
- arrived <15 min late
- Avg delay
- 14 min
- completed flights
- Cancelled
- 0.8%
- Flights/day
- 1.8
- last 12 months
- Duration
- 2h 50m
- scheduled
- Distance
- 1,036 mi
Monthly on-time trend
Best time to fly from MDW to SAT
Aim for departures around 7 a.m. (91% on-time); avoid 9 p.m. departures (60%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 75% | 17 min |
| Tuesday | 74% | 16 min |
| Wednesdaybest | 85% | 11 min |
| Thursday | 80% | 14 min |
| Friday | 74% | 17 min |
| Saturday | 78% | 9 min |
| Sunday | 77% | 14 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft52%
- Airline operations31%
- National airspace system14%
- Weather3%
Frequently asked questions
- How often are flights from MDW to SAT delayed?
- 23% of MDW–SAT 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 14 minutes.
- What is the best time of day to fly from MDW to SAT?
- Departures around 7 a.m. have the best record (91% on-time), while departures around 9 p.m. have the worst (60%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from MDW to SAT?
- The scheduled MDW–SAT flight time averages 2h 50m over 1,036 miles. Actual arrival times vary — flights on this route land 15+ minutes late 23% of the time.
- How often are MDW to SAT 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 MDW to SAT?
- July 2024 was the roughest month in this dataset, with only 52% of arrivals on time. The best was February 2026 at 96%. If your dates are flexible, that 45-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.