San Antonio (SAT) to Houston (IAH): On-Time Performance
Data through May 2026
The calendar drives reliability on SAT–IAH. January 2026 flights landed on schedule 92% of the time, but July 2024 dropped to 66% — a gap of 25 points. Across the full period the route averages 83% on-time against a national 78%. Morning departures also hold up better than evening ones (87% vs 78%), which matters most in the rough months.
- On-time
- 83%
- arrived <15 min late
- Avg delay
- 14 min
- completed flights
- Cancelled
- 1.3%
- Flights/day
- 6.7
- last 12 months
- Duration
- 1h 5m
- scheduled
- Distance
- 191 mi
Best airline from SAT to IAH
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| SkyWest Airlinesmost reliable | 84% | 18 min | 0.7% | 267 |
| United Airlines | 82% | 13 min | 1.4% | 4,544 |
Monthly on-time trend
Best time to fly from SAT to IAH
Aim for departures around 5 a.m. (93% on-time); avoid 4 p.m. departures (75%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 84% | 15 min |
| Tuesday | 85% | 13 min |
| Wednesday | 83% | 12 min |
| Thursday | 80% | 13 min |
| Friday | 80% | 15 min |
| Saturdaybest | 85% | 12 min |
| Sunday | 81% | 16 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft36%
- Airline operations26%
- National airspace system36%
- Weather2%
Frequently asked questions
- How often are flights from SAT to IAH delayed?
- 18% of SAT–IAH flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 14 minutes.
- Which airline is most reliable from SAT to IAH?
- SkyWest Airlines has the best on-time record on this route at 84%, based on 267 flights. 2 airlines flew SAT–IAH frequently enough to compare in this period.
- What is the best time of day to fly from SAT to IAH?
- Departures around 5 a.m. have the best record (93% on-time), while departures around 4 p.m. have the worst (75%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SAT to IAH?
- The scheduled SAT–IAH flight time averages 1h 5m over 191 miles. Actual arrival times vary — flights on this route land 15+ minutes late 18% of the time.
- How often are SAT to IAH flights cancelled?
- 1.3% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from SAT to IAH?
- July 2024 was the roughest month in this dataset, with only 66% of arrivals on time. The best was January 2026 at 92%. If your dates are flexible, that 25-point gap is worth planning around.
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Based on 4,811 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.