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

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

Historically, 78.2% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 3,528 flights.

HISTORICAL ROUTE SIGNALGenerally reliable
78.2%arrived on time
12.9%30+ min late
1.8%cancelled
3,528scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late6.2%all scheduled flights
120+ minutes late2.6%all scheduled flights
Diverted0.2%did not reach as scheduled
Average arrival+3.4 mincompleted flights

When is this route most reliable?

The same route can behave differently through the day. These are scheduled departure windows, not actual departure times. Small time windows with fewer than 40 flights are withheld.

Departure windowFlightsOn time30+ minCancelled
Early morning1,05681.1%9.7%2.1%
Late morning68584.8%9.5%1.6%
Afternoon1,04876.2%13.7%2.1%
Evening72570.9%19.0%1.4%

Weekday comparison

Day-of-week results use at least 30 scheduled flights per row. Look for broad patterns, not tiny percentage differences.

DayFlightsOn time30+ minCancelled
Monday53274.8%15.4%2.8%
Tuesday50583.4%10.1%0.8%
Wednesday49583.8%8.9%0.6%
Thursday53479.8%11.6%0.4%
Friday53577.0%13.1%1.7%
Saturday39776.3%14.1%3.8%
Sunday53072.3%16.8%3.2%

Airline comparison

Marketing-carrier results make codeshare flights easier to compare as travelers buy them. Dedicated route-airline reports require at least 160 flights.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines1,54675.6%14.2%1.3%
Delta Air Lines1,38384.4%9.4%2.5%
Frontier Airlines59970.5%17.4%1.7%

Monthly trend

Month-by-month results show whether a twelve-month average hides an unusual period.

MonthFlightsOn time30+ minCancelled
July 202532469.4%21.3%1.5%
August 202530579.7%12.8%1.3%
September 202529287.7%7.2%0.0%
October 202530487.5%8.9%0.0%
November 202528878.1%10.1%4.2%
December 202529075.5%14.8%3.1%
January 202627978.1%10.8%4.3%
February 202626079.2%11.2%0.8%
March 202628972.0%18.0%4.2%
April 202629183.8%9.3%1.0%
May 202629875.2%14.1%0.3%
June 202630872.7%14.9%1.6%

What drove reported delay minutes?

BTS cause minutes are reported for qualifying delayed flights. These shares describe recorded delay minutes—not the chance that a particular cause will affect your next flight.

Airline41.3%
Late aircraft33.0%
National airspace21.3%
Weather3.6%
Security0.8%
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.