BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
DelayOddsKnow the route before you book
MIA→STL

Miami, FL (MIA) to St. Louis, MO (STL) flight delay odds

71.7% of 1,141 official scheduled MIA-to-STL flights arrived on time; 18.7% arrived at least 30 minutes late and 0.7% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Reporting window: July 2025–June 2026 · Updated September 16, 2026

HISTORICAL ROUTE SIGNALGenerally reliable
71.7%arrived on time
18.7%30+ min late
0.7%cancelled
1,141scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late10.8%all scheduled flights
120+ minutes late3.4%all scheduled flights
Diverted0.3%did not reach as scheduled
Average arrival+10.5 mincompleted flights

Which departure time was most reliable for MIA to STL?

Among qualifying MIA-to-STL departure window results, Early morning had the highest on-time rate: 90.9% of 219 flights. Evening was lowest at 58.1% across 279 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning21990.9%5.0%0.0%
Afternoon38073.9%13.7%0.8%
Evening27958.1%30.8%0.7%
Night23163.2%26.8%1.3%

Which weekday was most reliable for MIA to STL?

Among qualifying MIA-to-STL weekday results, Wednesday had the highest on-time rate: 78.3% of 152 flights. Sunday was lowest at 61.2% across 178 flights.

DayFlightsOn time30+ minCancelled
Monday15368.0%22.9%2.0%
Tuesday15676.9%14.7%0.6%
Wednesday15278.3%12.5%0.0%
Thursday15070.7%20.0%0.0%
Friday15173.5%18.5%0.0%
Saturday20174.1%18.4%0.5%
Sunday17861.2%23.0%1.7%

Which airline was most reliable for MIA to STL?

Among qualifying MIA-to-STL airline results, Envoy Air had the highest on-time rate: 89.2% of 93 flights. Southwest Airlines was lowest at 66.4% across 441 flights.

AirlineFlightsOn time30+ minCancelled
American Airlines60372.8%19.1%1.0%
Southwest Airlines44166.4%20.6%0.5%
Envoy Air9389.2%6.5%0.0%
Republic Airways475.0%25.0%0.0%

Which month was most reliable for MIA to STL?

Among qualifying MIA-to-STL month results, November 2025 had the highest on-time rate: 82.9% of 105 flights. August 2025 was lowest at 53.4% across 73 flights.

MonthFlightsOn time30+ minCancelled
July 20257455.4%33.8%0.0%
August 20257353.4%38.4%0.0%
September 20256867.6%17.6%0.0%
October 20258473.8%20.2%0.0%
November 202510582.9%5.7%0.0%
December 20259868.4%18.4%0.0%
January 202611074.5%18.2%1.8%
February 202611072.7%15.5%0.0%
March 202613674.3%14.7%4.4%
April 20269674.0%18.8%0.0%
May 20268974.2%18.0%0.0%
June 20269877.6%16.3%0.0%

What drove MIA to STL delay minutes?

Late aircraft was the largest recorded MIA-to-STL delay category, accounting for 53.2% of 20,673 BTS-attributed delay minutes during July 2025–June 2026.

Airline33.2%
Late aircraft53.2%
National airspace10.8%
Weather2.5%
Security0.3%
This is historical evidence, not a forecast.

Weather, schedules and operations change. For a trip you have already booked, use the airline or airport for live status.