STL (St. Louis) to PHX (Phoenix) flights arrive on time 79% of the time. The most reliable airline on this route is null at 100%. The average delay is 74 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated August 2026.STL → PHX
STL (St. Louis) to PHX (Phoenix)
STL → PHX on-time performance by month
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JanFebMarAprMayJunJulAugSepOctNovDec
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This route is on time most of the time. About 79% of flights arrive on schedule.
Delays on this route are most often caused by the incoming plane arriving late.
Accurate?
null is significantly more reliable on this route at 100% on time vs Frontier Airlines at 68%.
Airline Comparison
leads at 100% on time; Frontier Airlines trails at 68%.
Accurate?
Good to know
Departing from STL
81% on timeTSA is currently ~23 min. Best time: 4 AM (about 5 min).
Arriving at PHX
82% on timeWhen flights into PHX are late, the average delay is 69 minutes. Build buffer if you have ground plans.
If connecting at PHX: TSA is ~14 min right now. Allow at least 60 minutes for a domestic connection.
Flight cancelled or delayed?
Check what owes you — refund rights, action plan, complaint email. Free.
Flying out of STL? We'll brief you.
Delays, TSA, weather, gates — we'll let you know if something matters.
Know someone flying soon?
Send them the link — delay data, TSA waits, weather, all free.
Data last updated August 2026. Source: Bureau of Transportation Statistics.