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

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

Historically, 68.7% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 4,447 flights.

HISTORICAL ROUTE SIGNALVariable
68.7%arrived on time
19.2%30+ min late
2.0%cancelled
4,447scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late10.7%all scheduled flights
120+ minutes late4.4%all scheduled flights
Diverted1.0%did not reach as scheduled
Average arrival+14.2 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 morning91484.1%8.6%1.8%
Late morning42683.1%9.9%0.7%
Afternoon1,69263.8%23.5%2.0%
Evening1,01456.0%26.1%2.2%
Night40171.1%17.7%3.2%

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
Monday64863.4%21.0%4.0%
Tuesday62274.9%15.3%1.1%
Wednesday59773.5%16.9%0.8%
Thursday64269.5%17.4%1.6%
Friday65268.7%18.9%1.4%
Saturday63672.6%19.0%1.1%
Sunday65058.9%25.5%3.5%

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
American Airlines3,01569.5%18.8%1.9%
United Airlines1,04069.6%18.6%0.9%
Spirit Airlines34658.7%24.3%6.1%
Frontier Airlines4671.7%21.7%2.2%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 202533754.9%30.3%2.1%
August 202533361.6%24.6%1.8%
September 202531571.1%17.1%0.0%
October 202532377.4%14.6%0.0%
November 202534775.2%14.1%3.2%
December 202538373.1%14.9%1.3%
January 202641570.1%19.8%3.4%
February 202641270.4%16.3%0.7%
March 202649859.4%24.7%4.8%
April 202640073.2%14.5%1.8%
May 202635473.4%16.4%0.6%
June 202633066.7%22.7%2.4%

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.

Airline25.6%
Late aircraft32.1%
National airspace35.0%
Weather7.2%
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.