Best Time to Fly SAT to IAH: On-Time Stats by Hour & Airline
San Antonio International → George Bush Intercontinental/Houston
Data through July 2026 · Last updated October 18, 2026
2,405 flights were scheduled from San Antonio (SAT) to Houston (IAH) in the last 12 months, and 82.0% of those that flew arrived on time, 4.4 points above the US average of 77.6%.
SkyWest Airlines was the most punctual of the 2 airlines on the route at 85.6%, while United Airlines trailed at 81.8%.
January has been the best month (89% on time) and Friday the weakest day of the week (80%).
0.6% of flights were cancelled, versus 1.8% nationally.
SAT to IAH 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 |
|---|---|---|---|---|
| SkyWest Airlines | 85.6% | 72 min | 0.9% | 105 |
| United Airlines | 81.8% | 60 min | 0.6% | 2,300 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SAT to IAH
On-time arrival % by scheduled departure hour (local time), 4,823 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 94.7% | 2.5% | 521 |
| 7am–8am | 82.6% | 1.2% | 730 |
| 9am–10am | 87.3% | 0.9% | 674 |
| 10am–11am | 75.8% | 2.9% | 34 |
| 11am–12pm | 87.5% | 0.4% | 273 |
| 12pm–1pm | 85.0% | 0.8% | 256 |
| 2pm–3pm | 83.0% | 0.4% | 562 |
| 4pm–5pm | 74.6% | 0.3% | 639 |
| 5pm–6pm | 77.3% | 1.1% | 530 |
| 6pm–7pm | 77.9% | 0.3% | 282 |
| 7pm–8pm | 80.6% | 0.6% | 322 |
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 IAH
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) | 89.8% | +6.6 pts | 0.0% | 98 |
| Christmas & New Year (Dec 20 - Jan 3) | 86.2% | +3.0 pts | 1.2% | 162 |
| Summer peak (Jun 15 - Aug 15) | 79.7% | -3.5 pts | 1.2% | 752 |
| All other days | 83.2% | — | 0.9% | 3,811 |
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).