Best Time to Fly SAT to MDW: On-Time Stats by Hour & Airline
San Antonio International → Chicago Midway International
Data through July 2026 · Last updated October 18, 2026
661 flights were scheduled from San Antonio (SAT) to Chicago (MDW) in the last 12 months, and 76.8% of those that flew arrived on time, 0.8 points below the US average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
October has been the best month (93% on time) and Sunday the weakest day of the week (78%).
1.1% of flights were cancelled, versus 1.8% nationally.
SAT to MDW 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 | 76.8% | 44 min | 1.1% | 661 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SAT to MDW
On-time arrival % by scheduled departure hour (local time), 1,393 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 96.3% | 0.7% | 136 |
| 6am–7am | 91.9% | 1.0% | 311 |
| 7am–8am | 95.5% | 2.9% | 69 |
| 8am–9am | 95.3% | 0.0% | 43 |
| 9am–10am | 87.6% | 1.9% | 107 |
| 11am–12pm | 83.3% | 0.0% | 36 |
| 12pm–1pm | Limited data | 1 | |
| 1pm–2pm | 90.9% | 0.0% | 33 |
| 2pm–3pm | 76.5% | 0.7% | 295 |
| 3pm–4pm | 61.1% | 0.0% | 177 |
| 4pm–5pm | 88.8% | 0.0% | 100 |
| 5pm–6pm | 75.6% | 2.3% | 43 |
| 6pm–7pm | 83.3% | 0.0% | 42 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SAT to MDW
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) | 75.0% | -9.2 pts | 0.0% | 60 |
| Summer peak (Jun 15 - Aug 15) | 84.0% | -0.1 pts | 1.1% | 267 |
| All other days | 84.2% | — | 0.7% | 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).