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

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

82.0% of 1,144 official scheduled STL-to-MIA flights arrived on time; 10.1% 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 SIGNALLower disruption
82.0%arrived on time
10.1%30+ min late
0.7%cancelled
1,144scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late5.1%all scheduled flights
120+ minutes late1.6%all scheduled flights
Diverted0.3%did not reach as scheduled
Average arrival+1.2 mincompleted flights

Which departure time was most reliable for STL to MIA?

Among qualifying STL-to-MIA departure window results, Early morning had the highest on-time rate: 88.5% of 503 flights. Evening was lowest at 72.4% across 196 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning50388.5%5.8%0.8%
Late morning22283.8%9.5%0.0%
Afternoon22374.0%15.2%0.4%
Evening19672.4%16.3%1.5%

Which weekday was most reliable for STL to MIA?

Among qualifying STL-to-MIA weekday results, Wednesday had the highest on-time rate: 92.1% of 152 flights. Saturday was lowest at 69.8% across 202 flights.

DayFlightsOn time30+ minCancelled
Monday15379.1%12.4%2.0%
Tuesday15686.5%9.0%1.3%
Wednesday15292.1%3.3%0.0%
Thursday15287.5%5.9%0.0%
Friday15186.1%9.9%0.0%
Saturday20269.8%17.3%0.0%
Sunday17877.5%10.7%1.7%

Which airline was most reliable for STL to MIA?

Among qualifying STL-to-MIA airline results, American Airlines had the highest on-time rate: 87.6% of 605 flights. Southwest Airlines was lowest at 74.9% across 442 flights.

AirlineFlightsOn time30+ minCancelled
American Airlines60587.6%7.6%1.0%
Southwest Airlines44274.9%13.1%0.5%
Envoy Air9381.7%9.7%0.0%
Republic Airways425.0%75.0%0.0%

Which month was most reliable for STL to MIA?

Among qualifying STL-to-MIA month results, April 2026 had the highest on-time rate: 93.8% of 96 flights. June 2026 was lowest at 73.7% across 99 flights.

MonthFlightsOn time30+ minCancelled
July 20257481.1%10.8%0.0%
August 20257378.1%11.0%0.0%
September 20256883.8%2.9%0.0%
October 20258483.3%8.3%0.0%
November 202510581.9%10.5%0.0%
December 20259978.8%13.1%0.0%
January 202611080.0%14.5%1.8%
February 202611088.2%5.5%0.0%
March 202613676.5%13.2%4.4%
April 20269693.8%4.2%0.0%
May 20269086.7%6.7%0.0%
June 20269973.7%17.2%0.0%

What drove STL to MIA delay minutes?

Late aircraft was the largest recorded STL-to-MIA delay category, accounting for 40.9% of 11,908 BTS-attributed delay minutes during July 2025–June 2026.

Airline29.9%
Late aircraft40.9%
National airspace22.5%
Weather6.7%
Security0.0%
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.