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

Atlanta, GA (ATL) to Chicago, IL (MDW) flight delay odds

74.3% of 3,527 official scheduled ATL-to-MDW flights arrived on time; 14.3% arrived at least 30 minutes late and 1.8% 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
74.3%arrived on time
14.3%30+ min late
1.8%cancelled
3,527scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late7.5%all scheduled flights
120+ minutes late3.1%all scheduled flights
Diverted0.7%did not reach as scheduled
Average arrival+10.7 mincompleted flights

Which departure time was most reliable for ATL to MDW?

Among qualifying ATL-to-MDW departure window results, Early morning had the highest on-time rate: 84.0% of 680 flights. Night was lowest at 62.6% across 580 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning68084.0%6.9%2.1%
Late morning68182.4%7.6%2.2%
Afternoon90075.6%13.2%1.6%
Evening68665.0%20.3%1.2%
Night58062.6%25.3%2.4%

Which weekday was most reliable for ATL to MDW?

Among qualifying ATL-to-MDW weekday results, Wednesday had the highest on-time rate: 82.0% of 495 flights. Sunday was lowest at 69.2% across 529 flights.

DayFlightsOn time30+ minCancelled
Monday53171.8%18.1%1.5%
Tuesday50678.9%11.1%1.2%
Wednesday49582.0%10.1%0.4%
Thursday53473.4%13.5%0.9%
Friday53572.1%15.0%1.5%
Saturday39773.3%14.1%3.8%
Sunday52969.2%17.8%4.0%

Which airline was most reliable for ATL to MDW?

Among qualifying ATL-to-MDW airline results, Delta Air Lines had the highest on-time rate: 79.2% of 1,383 flights. Frontier Airlines was lowest at 63.8% across 599 flights.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines1,54574.0%13.1%1.6%
Delta Air Lines1,38379.2%10.3%2.2%
Frontier Airlines59963.8%26.5%1.5%

Which month was most reliable for ATL to MDW?

Among qualifying ATL-to-MDW month results, September 2025 had the highest on-time rate: 90.4% of 292 flights. May 2026 was lowest at 64.0% across 297 flights.

MonthFlightsOn time30+ minCancelled
July 202532464.2%22.8%1.2%
August 202530574.4%15.1%1.0%
September 202529290.4%5.8%0.0%
October 202530479.6%10.2%0.0%
November 202528876.4%12.2%4.9%
December 202529069.7%16.6%3.1%
January 202627879.5%13.3%3.6%
February 202626177.4%10.7%0.4%
March 202628967.8%17.3%4.8%
April 202629182.1%7.9%0.7%
May 202629764.0%19.5%0.3%
June 202630868.2%18.5%2.3%

What drove ATL to MDW delay minutes?

Late aircraft was the largest recorded ATL-to-MDW delay category, accounting for 46.7% of 53,950 BTS-attributed delay minutes during July 2025–June 2026.

Airline33.3%
Late aircraft46.7%
National airspace15.1%
Weather4.6%
Security0.4%
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.