Carrier route record
OOIAH→SAT
SkyWest Airlines · Houston to San Antonio
- Flights
- 126
- Period
- September 2025 to August 2026
- Share of route
- 5%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with SkyWest Airlines.
SkyWest on IAH to SAT earns a B+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 126 flights, with a median arrival 7 minutes early.
Set against the rest of the country, SkyWest's IAH to SAT record is 7 points better than the US average of 77.3%. That gap is worth roughly 67 fewer late arrivals for every thousand flights.
Key figures
On time
84.0%
Arrivals under 15 minutes late, of 125 completed flights
Avg delay
71 min
Across delayed arrivals only, not all flights
Cancelled
0.79%
National rate is 1.89%
Whole route
83.1%
Every carrier on IAH to SAT, 2,373 flights
These figures cover 126 flights between September 2025 and August 2026. Beyond the headline rate, 8.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
SkyWest against every carrier on IAH to SAT
SkyWest flew 126 of the 2,373 flights on IAH to SAT, about 5% of it. Its 84.0% on time is about level with the route as a whole at 83.1%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from SkyWest at 84.0% to United at 83.0%.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SkyWest Airlines (this page)thin sample | 126 | 84.0% | 71 min | 0.79% | B+ |
| United Airlines | 2,247 | 83.0% | 58 min | 0.36% | B+ |
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Departure window
When SkyWest runs best on this route
Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 126 flights.
There are not enough flights in each departure window to split SkyWest's IAH to SAT record by time of day without the percentages moving on noise. The headline rate of 84.0% is the reliable figure here.
Across the year
SkyWest on IAH to SAT through the year
- Jul–Sep 20253 flights—
- Oct–Dec 202517 flights—
- Jan–Mar 202625 flights—
- Apr–Jun 202634 flights73.5%
- Jul–Sep 202647 flights91.5%
Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 84.0% on time across 126 flights.
Split by quarter, SkyWest on IAH to SAT logged 3 flights in Jul–Sep 2025, 17 flights in Oct–Dec 2025, 25 flights in Jan–Mar 2026, 34 flights in Apr–Jun 2026 and 47 flights in Jul–Sep 2026. Fewer than three of those quarters carried the 30 completed flights this site needs before printing a rate, so the 84.0% annual figure is the one to use.
Arrival by arrival
How late SkyWest on IAH to SAT runs when it is late
The 20 late arrivals split 5 under half an hour, 5 between 30 and 60 minutes, and 10 an hour or more.
- 15+ min early24 flights19.2%
- Within 15 min81 flights64.8%
- 15–29 min late5 flights4.0%
- 30–59 min late5 flights4.0%
- 1–2 hours late7 flights5.6%
- 2+ hours late3 flights2.4%
Scale runs 0% to 100%.
Share of 125 completed flights by arrival against schedule.
6 of 22 late departures made up the time and arrived on time, 27% of them. 4 flights left on time and still arrived late.
The worst days
Worst days for SkyWest on IAH to SAT
The latest arrival of the period was on 7 December 2025, 3 hours 6 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. Three of the five worst days fell in June 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 7 December 2025 | 3 hours 6 minutes | National Airspace System |
| 19 June 2026 | 2 hours 44 minutes | Late-arriving aircraft |
| 13 July 2026 | 2 hours 2 minutes | Extreme weather |
| 3 June 2026 | 1 hour 55 minutes | National Airspace System |
| 18 June 2026 | 1 hour 37 minutes | Carrier |
Delay causes
Why SkyWest runs late on this route
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 1,418 reported delay minutes.
- 38%National Airspace System
- 26%Late-arriving aircraft
- 25%Carrier
- 12%Extreme weather
Extreme weather accounts for 12% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the monthly strip above is the more useful view of the risk. The national share is 6%, so this operation carries roughly 1.9 times the usual weather exposure. The split is drawn from 1,418 reported delay minutes.
38% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 539 minutes out of 1,418, against a national NAS share of 21%.
Cancellations are rare at 0.79%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and stage length
What a delay here costs
8.0% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.
At 191 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 2pm–5pm window matters as much as it does.
The return leg is a different operation and performs like one: it runs 87.3% on time across 127 flights, 3 points above this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 3 points of difference.
One caution: this is a thin sample. 126 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking SkyWest on IAH to SAT
Put together: treat all of this as provisional. 126 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 84.0% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 125 completed flights over 12 months sit behind that.
Related
Where to go next
- IAH to SAT, every carrier
- SkyWest on SAT to IAH, the return leg
- United Airlines on IAH to SAT83.0%
- SkyWest Airlines network-wide record
- George Bush Intercontinental (IAH) delay statistics
- San Antonio International (SAT) delay statistics
- Connecting flights: how much buffer the data says you need
- How to read this site: grades, sample sizes, and honest caveats
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.