STL (St. Louis) to MIA (Miami) flights arrive on time 81% of the time. The most reliable airline on this route is American Airlines at 85%. The average delay is 68 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated May 2026.STL → MIA
STL (St. Louis) to MIA (Miami)
STL → MIA on-time performance by month
24
25
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
This route is on time most of the time. About 81% of flights arrive on schedule.
Delays on this route are most often caused by the incoming plane arriving late.
Accurate?
American Airlines edges out null on this route — 85% vs 77% on time.
Airline Comparison
American Airlines leads at 85% on time; trails at 77%.
Accurate?
Good to know
Departing from STL
81% on timeTSA is currently ~24 min. Best time: 4 AM (about 5 min).
Arriving at MIA
76% on timeWhen flights into MIA are late, the average delay is 75 minutes. Build buffer if you have ground plans.
If connecting at MIA: TSA is ~20 min right now. Allow at least 60 minutes for a domestic connection.
Flight cancelled or delayed?
Check what American Airlines owes you — refund rights, action plan, complaint email. Free.
Let us watch your flight
We worry about delays, TSA, weather, and gates so you don't have to.
Know someone flying soon?
Send them the link — delay data, TSA waits, weather, all free.
Data last updated May 2026. Source: Bureau of Transportation Statistics.