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

Atlanta, GA (ATL) to Miami, FL (MIA) flight delay odds

69.8% of 6,229 official scheduled ATL-to-MIA flights arrived on time; 19.1% arrived at least 30 minutes late and 1.4% 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 SIGNALVariable
69.8%arrived on time
19.1%30+ min late
1.4%cancelled
6,229scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late10.5%all scheduled flights
120+ minutes late4.0%all scheduled flights
Diverted0.3%did not reach as scheduled
Average arrival+15.3 mincompleted flights

Which departure time was most reliable for ATL to MIA?

Among qualifying ATL-to-MIA departure window results, Early morning had the highest on-time rate: 83.6% of 1,376 flights. Evening was lowest at 57.6% across 1,233 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning1,37683.6%9.6%1.2%
Late morning1,37577.0%11.9%1.5%
Afternoon1,65564.2%23.1%1.1%
Evening1,23357.6%29.3%1.9%
Night59062.2%25.9%1.7%

Which weekday was most reliable for ATL to MIA?

Among qualifying ATL-to-MIA weekday results, Wednesday had the highest on-time rate: 78.5% of 818 flights. Sunday was lowest at 61.3% across 935 flights.

DayFlightsOn time30+ minCancelled
Monday92566.6%20.1%2.8%
Tuesday84977.7%13.9%0.6%
Wednesday81878.5%13.4%0.4%
Thursday91771.9%16.4%0.5%
Friday92569.5%19.6%1.1%
Saturday86064.8%22.9%1.9%
Sunday93561.3%26.7%2.5%

Which airline was most reliable for ATL to MIA?

Among qualifying ATL-to-MIA airline results, American Airlines had the highest on-time rate: 74.4% of 1,527 flights. Republic Airways was lowest at 63.6% across 44 flights.

AirlineFlightsOn time30+ minCancelled
Delta Air Lines3,29869.0%18.5%1.4%
American Airlines1,52774.4%16.6%0.9%
Frontier Airlines86464.2%26.3%1.6%
Spirit Airlines26970.3%19.7%4.1%
Envoy Air22773.6%16.3%1.3%
Republic Airways4463.6%27.3%0.0%

Which month was most reliable for ATL to MIA?

Among qualifying ATL-to-MIA month results, September 2025 had the highest on-time rate: 79.6% of 421 flights. July 2025 was lowest at 57.0% across 519 flights.

MonthFlightsOn time30+ minCancelled
July 202551957.0%30.1%1.7%
August 202549866.9%22.3%0.8%
September 202542179.6%11.9%0.0%
October 202548579.0%12.0%0.4%
November 202549571.1%17.6%1.4%
December 202558767.1%20.8%2.2%
January 202654764.2%21.8%3.1%
February 202649174.7%14.5%0.4%
March 202657163.0%22.2%4.2%
April 202657374.2%17.1%0.2%
May 202655269.0%21.0%0.5%
June 202649076.1%15.7%1.2%

What drove ATL to MIA delay minutes?

Late aircraft was the largest recorded ATL-to-MIA delay category, accounting for 37.9% of 126,739 BTS-attributed delay minutes during July 2025–June 2026.

Airline37.3%
Late aircraft37.9%
National airspace20.6%
Weather4.2%
Security0.1%
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.