Best Time to Fly HOU to SAT: On-Time Stats by Hour & Airline
William P Hobby → San Antonio International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 78.1% of Houston (HOU) to San Antonio (SAT) flights arrived on time (1,330 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.
Over 24 months, Tuesday was the most reliable day (84% on time) and June the worst month (66%).
The cancellation rate was 0.1% (US average 1.8%).
HOU 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 | 78.1% | 50 min | 0.1% | 1,330 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly HOU to SAT
On-time arrival % by scheduled departure hour (local time), 2,848 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | 89.8% | 0.0% | 108 |
| 8am–9am | 94.6% | 0.5% | 391 |
| 9am–10am | 91.3% | 0.0% | 104 |
| 10am–11am | 86.2% | 0.3% | 319 |
| 11am–12pm | 86.1% | 0.0% | 151 |
| 12pm–1pm | 80.0% | 0.0% | 50 |
| 1pm–2pm | 89.3% | 1.2% | 161 |
| 2pm–3pm | 66.7% | 0.0% | 201 |
| 3pm–4pm | 77.3% | 0.0% | 88 |
| 4pm–5pm | 82.2% | 0.0% | 107 |
| 5pm–6pm | 79.8% | 0.0% | 124 |
| 6pm–7pm | 82.9% | 1.4% | 143 |
| 7pm–8pm | 52.0% | 0.0% | 50 |
| 8pm–9pm | 78.2% | 0.3% | 358 |
| 9pm–10pm | 71.1% | 0.5% | 195 |
| 10pm–11pm | 65.0% | 0.3% | 298 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on HOU 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) | 94.6% | +12.8 pts | 0.0% | 56 |
| Christmas & New Year (Dec 20 - Jan 3) | 75.2% | -6.7 pts | 0.0% | 117 |
| Summer peak (Jun 15 - Aug 15) | 74.3% | -7.6 pts | 0.2% | 468 |
| All other days | 81.9% | — | 0.4% | 2,207 |
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).