Best Time to Fly ORD to SAT: On-Time Stats by Hour & Airline
Chicago O'Hare International → San Antonio International
Data through July 2026 · Last updated October 18, 2026
1,977 flights were scheduled from Chicago (ORD) to San Antonio (SAT) in the last 12 months, and 74.1% of those that flew arrived on time, 3.5 points below the US average of 77.6%.
Republic Airways was the most punctual of the 5 airlines on the route at 82.3%, while American Airlines trailed at 66.4%.
October has been the best month (88% on time) and Friday the weakest day of the week (73%).
2.0% of flights were cancelled, versus 1.8% nationally.
ORD 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 |
|---|---|---|---|---|
| Republic Airways | 82.3% | 62 min | 4.0% | 101 |
| SkyWest Airlines | 81.2% | 60 min | 3.5% | 116 |
| Envoy Air | 77.4% | 58 min | 2.4% | 383 |
| United Airlines | 75.3% | 71 min | 1.3% | 860 |
| American Airlines | 66.4% | 81 min | 2.1% | 517 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ORD to SAT
On-time arrival % by scheduled departure hour (local time), 3,626 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | Limited data | 1 | |
| 8am–9am | 93.5% | 0.7% | 140 |
| 9am–10am | 82.7% | 0.5% | 1,043 |
| 10am–11am | 81.7% | 1.1% | 183 |
| 11am–12pm | Limited data | 21 | |
| 12pm–1pm | 80.0% | 0.0% | 65 |
| 1pm–2pm | 78.6% | 2.5% | 435 |
| 2pm–3pm | 72.0% | 0.6% | 324 |
| 3pm–4pm | Limited data | 22 | |
| 4pm–5pm | Limited data | 7 | |
| 6pm–7pm | 76.8% | 1.8% | 110 |
| 7pm–8pm | 66.4% | 1.1% | 550 |
| 8pm–9pm | 68.5% | 2.6% | 642 |
| 9pm–10pm | 32.9% | 6.2% | 81 |
| 11pm–12am | Limited data | 2 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on ORD 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) | 60.3% | -17.0 pts | 6.5% | 62 |
| Christmas & New Year (Dec 20 - Jan 3) | 75.4% | -2.0 pts | 0.0% | 122 |
| Summer peak (Jun 15 - Aug 15) | 67.5% | -9.8 pts | 2.0% | 661 |
| All other days | 77.4% | — | 1.3% | 2,781 |
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).