Route · IAH → SAT · 2020–2025 BTS data
Houston to San Antonio
The IAH–SAT corridor (Houston, TX → San Antonio, TX) runs ahead of the national average, served by 12 carriers across roughly 191 miles.
Data updated 2026-06-13
- 81.1%
- On-time
- +2.1 pts
- vs US avg
- 70 min
- Delay when late
- 13,003
- Flights
Cancelled
1.7%
Best Month
Sep 2025 87%
Worst Month
Jul 2024 59%
Distance
191 mi
Carriers
12
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 217 | 35 | 0 | 0 | UA,OO |
| Nov 2025 | 207 | 34 | 2 | 0 | OO,UA |
| Oct 2025 | 213 | 31 | 0 | 0 | UA |
| Sep 2025 | 229 | 29 | 0 | 0 | UA,OO |
| Aug 2025 | 208 | 44 | 1 | 0 | OO,UA |
| Jul 2025 | 185 | 52 | 2 | 0 | OO,UA |
| Jun 2025 | 212 | 57 | 9 | 0 | OO,UA |
| May 2025 | 199 | 39 | 3 | 0 | OO,UA |
| Apr 2025 | 142 | 23 | 0 | 1 | OO,UA |
| Mar 2025 | 230 | 44 | 0 | 0 | OO,UA |
| Feb 2025 | 188 | 39 | 0 | 0 | OO,UA |
| Jan 2025 | 176 | 34 | 9 | 1 | OO,UA |
| Dec 2024 | 182 | 46 | 3 | 1 | OO,UA |
| Nov 2024 | 222 | 33 | 0 | 1 | OO,UA |
| Oct 2024 | 234 | 36 | 0 | 0 | UA,OO |
| Sep 2024 | 230 | 41 | 0 | 0 | OO,UA |
| Aug 2024 | 218 | 55 | 3 | 0 | OO,UA |
| Jul 2024 | 200 | 83 | 17 | 0 | OO,UA |
| Jun 2024 | 139 | 43 | 3 | 0 | OO,UA |
| May 2024 | 145 | 57 | 5 | 0 | OO,UA |
| Apr 2024 | 151 | 36 | 1 | 0 | OO,UA |
| Mar 2024 | 114 | 30 | 1 | 0 | OO,UA |
| Feb 2024 | 130 | 21 | 0 | 0 | OO,UA |
| Jan 2024 | 158 | 38 | 19 | 0 | OO,UA |
Cancellation Rate
1.7%
78 of 4,529 flights
Diversion Rate
0.1%
4 of 4,529 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
IAH - Houston
Full on-time, delay-cause, and seasonal performance for Houston, TX.
Origin airport →SAT - San Antonio
Full on-time, delay-cause, and seasonal performance for San Antonio, TX.
Destination airport →Compare the two airports
See IAH and SAT side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to IAH–SAT.
Routes with a similar on-time rate
What the Data Says About IAH to SAT
13,003 tracked flights put the IAH to SAT pairing (Houston to San Antonio) at a 81.1% on-time rate, squarely in line with the wider network. Delays that do occur run 70.3 minutes on average. Across the 191-mile route and its 12 carriers, the trailing 24 months show 1.7% cancelled and 0.1% diverted (4,529 flights sampled).
The monthly split is wide on this route: Sep 2025 posted the strongest performance at 87% on-time, while Jul 2024 came in at just 59% - a 29-point swing worth factoring into travel timing.
Frequently Asked Questions
How often are flights delayed from IAH to SAT? ▼
What is the cancellation rate for IAH to SAT? ▼
How far is the flight from IAH to SAT? ▼
When is the best time to fly from IAH to SAT? ▼
Flight Guides
Tips and data-driven advice for choosing reliable routes.
Explore PlainFlights
Data source
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.
Read our methodology - how this data is sourced, computed, and verified.
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.