DEN (Denver) to STL (St. Louis) flights arrive on time 77% of the time. The most reliable airline on this route is Frontier Airlines at 82%. The average delay is 59 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated October 2026.DEN → STL
DEN (Denver) to STL (St. Louis)
DEN → STL on-time performance by month
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JanFebMarAprMayJunJulAugSepOctNovDec
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This route is on time most of the time. About 77% of flights arrive on schedule.
Delays on this route are most often caused by the incoming plane arriving late.
Accurate?
Frontier Airlines edges out SkyWest Airlines on this route — 82% vs 75% on time.
Airline Comparison
Frontier Airlines leads at 82% on time; SkyWest Airlines trails at 75%.
Accurate?
Good to know
Departing from DEN
78% on timeExpect ~18 min sitting on the taxiway after your gate pushes back. DEN has long runway queues.
TSA is currently ~21 min. Best time: 4 AM (about 5 min).
Arriving at STL
80% on timeWhen flights into STL are late, the average delay is 64 minutes. Build buffer if you have ground plans.
If connecting at STL: TSA is ~30 min right now. Allow at least 60 minutes for a domestic connection.
Flight cancelled or delayed?
Check what Frontier Airlines owes you — refund rights, action plan, complaint email. Free.
Flying out of DEN? 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 October 2026. Source: Bureau of Transportation Statistics.