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

Chicago, IL (MDW) to Miami, FL (MIA) flight delay odds

Historically, 72.2% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 511 flights.

HISTORICAL ROUTE SIGNALGenerally reliable
72.2%arrived on time
16.8%30+ min late
1.2%cancelled
511scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late7.4%all scheduled flights
120+ minutes late2.2%all scheduled flights
Diverted0.6%did not reach as scheduled
Average arrival+10.3 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 morning21675.5%15.3%0.0%
Late morning9481.9%8.5%1.1%
Afternoon8259.8%25.6%0.0%
Evening11866.9%20.3%4.2%

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
Monday7875.6%19.2%2.6%
Tuesday4185.4%2.4%0.0%
Wednesday4481.8%11.4%0.0%
Thursday7569.3%20.0%1.3%
Friday7574.7%16.0%0.0%
Saturday10964.2%21.1%1.8%
Sunday8968.5%16.9%1.1%

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 Airlines44772.0%15.9%1.1%
Frontier Airlines6473.4%23.4%1.6%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 20253971.8%17.9%0.0%
August 20252962.1%27.6%0.0%
September 20252580.0%16.0%0.0%
October 20252495.8%0.0%0.0%
November 20253976.9%10.3%7.7%
December 20254562.2%28.9%0.0%
January 20265162.7%23.5%0.0%
February 20263884.2%10.5%0.0%
March 20267967.1%19.0%2.5%
April 20265874.1%15.5%1.7%
May 20265379.2%13.2%0.0%
June 20263164.5%9.7%0.0%

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.

Airline33.6%
Late aircraft36.9%
National airspace29.0%
Weather0.5%
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.