Phoenix to St. Louis

What the Data Says About PHX to STL

The Phoenix to St. Louis corridor (PHX → STL) covers roughly 1,262 miles and is served by 19 carriers, based on Bureau of Transportation Statistics reporting. Across 11,922 flights in the dataset, this route posts a 81.3% on-time rate with an average delay of 59.8 minutes when flights run late. Over the most recent 24 months of BTS data, 4,663 flights were recorded on this pairing — 25 cancelled (0.5%) and 16 diverted (0.3%). Those baseline metrics tell you what to expect before you book.

Having 19 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 11,922 total flights analyzed, the 81.3% on-time figure is statistically meaningful rather than a small-sample fluke. The 59.8-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, Nov 2024 posted the best performance on this corridor at 91% on-time, while Jul 2024 came in at 66% on-time — a 24-point gap between best and worst recent month. For travelers evaluating the PHX to STL route, the combination of a 81.3% on-time rate, 59.8-minute average delay, 0.5% recent cancellation rate, and 19 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.