San Antonio to Houston

What the Data Says About SAT to IAH

The San Antonio to Houston corridor (SAT → IAH) covers roughly 191 miles and is served by 12 carriers, based on Bureau of Transportation Statistics reporting. Across 12,995 flights in the dataset, this route posts a 85.3% on-time rate with an average delay of 76.2 minutes when flights run late. Over the most recent 24 months of BTS data, 4,526 flights were recorded on this pairing — 85 cancelled (1.9%) and 4 diverted (0.1%). Those baseline metrics tell you what to expect before you book.

Having 12 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 12,995 total flights analyzed, the 85.3% on-time figure is statistically meaningful rather than a small-sample fluke. The 76.2-minute average delay applies only to flights that actually ran late, so it is not the average wait across all departures — the majority of flights on this route depart on time under the BTS definition of a delay (15+ minutes past schedule).

Looking at recent months, Mar 2024 posted the best performance on this corridor at 91% on-time, while Jul 2024 came in at 69% on-time — a 22-point gap between best and worst recent month. For travelers evaluating the SAT to IAH route, the combination of a 85.3% on-time rate, 76.2-minute average delay, 1.9% recent cancellation rate, and 12 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.