SAT to IAH flight delays
San Antonio, TX (SAT) Houston, TX (IAH) · 191 miles
171 flights · March 2025 – August 2026 · US Bureau of Transportation Statistics
77.19%
Arrived on time
Within 15 minutes of schedule
0%
Cancelled
Share of scheduled flights
61 min
When late, late by
Average across delayed arrivals
15 min
Delay per flight
Averaged over every flight flown
What the record says about this route
The two directions do not behave alike. IAH to SAT arrives on time 8.2 points less often than the outbound. Delay accumulates through the flying day, so whichever direction is scheduled later tends to carry the worse record — which is an argument for booking the morning departure if the choice exists.
Only United Airlines flies this route in the published record, so there is no choice to weigh — the route's figures and the airline's are the same figures.
The San Antonio to Houston route sits close to the middle of the record — neither notably punctual nor notably late.
Which airline should you fly on this route?
Over March 2025 – August 2026, United Airlines arrived on time most often on SAT to IAH.
Every airline on SAT to IAH
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| United Airlines | 150 | 76.67% | 0% | 61 min | C |
| SkyWest Airlines | 21 | 80.95% | 0% | 64 min | — |
The return leg
IAH to SAT Houston back to San Antonio 69.01% on time DOther routes from San Antonio
Common questions
Are flights from San Antonio to Houston usually delayed?
77.19% of flights on the SAT to IAH route arrived within 15 minutes of schedule, so roughly 2 in every ten arrived late. That is about the same as the average route in this record.
Which airlines fly from San Antonio to Houston?
Only United Airlines appears in the published record on this route, with 150 flights and 76.67% arriving on time.
How often are SAT to IAH flights cancelled?
0% of scheduled flights did not operate — about 1 in every thousand. That is in the normal range.
When SAT to IAH flights are late, how late are they?
About 61 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on SAT to IAH during March 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →