Best Time to Fly MDW to SAT: On-Time Stats by Hour & Airline
Chicago Midway International → San Antonio International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 77.3% of Chicago (MDW) to San Antonio (SAT) flights arrived on time (661 scheduled flights). That is in line with the national average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
February has been the best month (90% on time) and Friday the weakest day of the week (75%).
1.2% of flights were cancelled, versus 1.8% nationally.
MDW to SAT on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlines | 77.3% | 55 min | 1.2% | 661 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly MDW to SAT
On-time arrival % by scheduled departure hour (local time), 1,393 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | 91.0% | 1.4% | 146 |
| 8am–9am | 85.1% | 0.0% | 235 |
| 9am–10am | 86.4% | 0.0% | 125 |
| 10am–11am | 82.6% | 0.6% | 180 |
| 11am–12pm | Limited data | 21 | |
| 12pm–1pm | Limited data | 3 | |
| 1pm–2pm | Limited data | 2 | |
| 2pm–3pm | Limited data | 10 | |
| 3pm–4pm | 68.2% | 0.0% | 63 |
| 4pm–5pm | 82.5% | 0.0% | 57 |
| 5pm–6pm | 68.3% | 0.0% | 41 |
| 6pm–7pm | Limited data | 22 | |
| 7pm–8pm | 74.3% | 0.0% | 70 |
| 8pm–9pm | 75.0% | 0.6% | 157 |
| 9pm–10pm | 64.5% | 2.1% | 188 |
| 10pm–11pm | 66.2% | 2.7% | 73 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on MDW to SAT
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | Limited data | 26 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 80.0% | -1.4 pts | 0.0% | 60 |
| Summer peak (Jun 15 - Aug 15) | 67.5% | -13.8 pts | 0.8% | 267 |
| All other days | 81.4% | — | 0.8% | 1,040 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).