ORD (Chicago) to STL (St. Louis) flights arrive on time 77% of the time. The most reliable airline on this route is Republic Airways at 85%. The average delay is 71 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated October 2026.ORD → STL
ORD (Chicago) to STL (St. Louis)
ORD → STL on-time performance by month
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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?
Republic Airways is significantly more reliable on this route at 85% on time vs American Airlines at 68%.
Airline Comparison
Republic Airways leads at 85% on time; American Airlines trails at 68%.
Accurate?
Good to know
Departing from ORD
77% on timeExpect ~22 min sitting on the taxiway after your gate pushes back. ORD has long runway queues.
TSA is currently ~36 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 Republic Airways owes you — refund rights, action plan, complaint email. Free.
Flying out of ORD? 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.