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

St. Louis, MO (STL) to Atlanta, GA (ATL) flight delay odds

83.6% of 3,705 official scheduled STL-to-ATL flights arrived on time; 9.3% arrived at least 30 minutes late and 1.7% 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
83.6%arrived on time
9.3%30+ min late
1.7%cancelled
3,705scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late5.0%all scheduled flights
120+ minutes late2.1%all scheduled flights
Diverted0.2%did not reach as scheduled
Average arrival-0.9 mincompleted flights

Which departure time was most reliable for STL to ATL?

Among qualifying STL-to-ATL departure window results, Early morning had the highest on-time rate: 92.5% of 957 flights. Evening was lowest at 73.6% across 890 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning95792.5%3.8%1.4%
Late morning85088.8%5.6%1.6%
Afternoon1,00479.6%12.4%1.5%
Evening89073.6%15.3%2.5%

Which weekday was most reliable for STL to ATL?

Among qualifying STL-to-ATL weekday results, Wednesday had the highest on-time rate: 91.4% of 512 flights. Sunday was lowest at 77.2% across 562 flights.

DayFlightsOn time30+ minCancelled
Monday56279.0%14.1%1.6%
Tuesday52086.2%6.5%1.0%
Wednesday51291.4%4.5%0.4%
Thursday56487.2%5.7%0.9%
Friday56083.9%10.2%2.0%
Saturday42580.2%12.7%3.1%
Sunday56277.2%11.7%3.4%

Which airline was most reliable for STL to ATL?

Among qualifying STL-to-ATL airline results, Delta Air Lines had the highest on-time rate: 87.4% of 2,371 flights. Frontier Airlines was lowest at 61.3% across 204 flights.

AirlineFlightsOn time30+ minCancelled
Delta Air Lines2,37187.4%7.4%2.0%
Southwest Airlines1,13079.6%11.4%1.2%
Frontier Airlines20461.3%20.1%2.0%

Which month was most reliable for STL to ATL?

Among qualifying STL-to-ATL month results, September 2025 had the highest on-time rate: 95.0% of 317 flights. March 2026 was lowest at 76.0% across 283 flights.

MonthFlightsOn time30+ minCancelled
July 202535180.6%13.4%0.6%
August 202533185.5%9.4%1.5%
September 202531795.0%3.2%0.0%
October 202534889.7%4.9%0.0%
November 202528481.0%10.9%3.2%
December 202531179.1%12.9%1.6%
January 202627982.1%6.1%6.5%
February 202625488.2%5.9%0.8%
March 202628376.0%13.4%3.2%
April 202629984.3%9.7%2.0%
May 202633080.3%10.6%1.2%
June 202631880.8%11.0%1.3%

What drove STL to ATL delay minutes?

Late aircraft was the largest recorded STL-to-ATL delay category, accounting for 45.1% of 38,263 BTS-attributed delay minutes during July 2025–June 2026.

Airline33.9%
Late aircraft45.1%
National airspace15.4%
Weather5.6%
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.