Houston to Killeen

What the Data Says About IAH to GRK

The Houston to Killeen corridor (IAH → GRK) covers roughly 166 miles and is served by 3 carriers, based on Bureau of Transportation Statistics reporting. Across 844 flights in the dataset, this route posts a 83.8% on-time rate with an average delay of 89.4 minutes when flights run late. Over the most recent 24 months of BTS data, 844 flights were recorded on this pairing — 21 cancelled (2.5%) and 3 diverted (0.4%). Those baseline metrics tell you what to expect before you book.

Having 3 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 844 total flights analyzed, the 83.8% on-time figure is statistically meaningful rather than a small-sample fluke. The 89.4-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 2020 posted the best performance on this corridor at 96% on-time, while Jul 2021 came in at 49% on-time — a 46-point gap between best and worst recent month. For travelers evaluating the IAH to GRK route, the combination of a 83.8% on-time rate, 89.4-minute average delay, 2.5% recent cancellation rate, and 3 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.