STL (St. Louis) to PHX (Phoenix) flights arrive on time 80% of the time. The most reliable airline on this route is SkyWest Airlines at 83%. The average delay is 70 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated May 2026.STL → PHX
STL (St. Louis) to PHX (Phoenix)
STL → PHX on-time performance by month
24
25
JanFebMarAprMayJunJulAugSepOctNovDec
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This route is on time most of the time. About 80% of flights arrive on schedule.
Delays on this route are most often caused by the incoming plane arriving late.
Accurate?
SkyWest Airlines is significantly more reliable on this route at 83% on time vs Frontier Airlines at 68%.
Airline Comparison
SkyWest Airlines leads at 83% on time; Frontier Airlines trails at 68%.
Accurate?
Good to know
Departing from STL
81% on timeTSA is currently ~24 min. Best time: 4 AM (about 5 min).
Arriving at PHX
82% on timeWhen flights into PHX are late, the average delay is 67 minutes. Build buffer if you have ground plans.
If connecting at PHX: TSA is ~15 min right now. Allow at least 60 minutes for a domestic connection.
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Data last updated May 2026. Source: Bureau of Transportation Statistics.