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

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

Historically, 68.6% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 6,406 flights.

HISTORICAL ROUTE SIGNALVariable
68.6%arrived on time
18.5%30+ min late
2.3%cancelled
6,406scheduled 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 late5.0%all scheduled flights
Diverted0.5%did not reach as scheduled
Average arrival+18.2 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 morning1,10083.0%8.7%2.1%
Late morning1,43779.5%11.1%1.5%
Afternoon1,72368.3%19.0%1.9%
Evening1,56350.7%29.9%3.3%
Night58363.6%22.6%3.6%

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
Monday95664.5%21.8%2.8%
Tuesday91571.5%17.6%1.6%
Wednesday89872.9%14.5%1.2%
Thursday93368.5%18.6%1.9%
Friday94668.1%18.5%2.0%
Saturday82070.2%18.0%2.6%
Sunday93864.9%19.8%4.2%

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
Delta Air Lines2,62567.0%17.9%2.2%
United Airlines1,61172.7%16.7%1.6%
Frontier Airlines71161.0%27.6%2.7%
American Airlines68869.9%18.5%3.1%
Envoy Air36469.8%18.4%2.2%
Republic Airways28767.6%15.0%5.9%
Spirit Airlines7582.7%9.3%0.0%
SkyWest Airlines4080.0%7.5%5.0%
PSA Airlines5100.0%0.0%0.0%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 202557064.6%25.3%2.8%
August 202557376.6%14.0%1.7%
September 202554184.3%7.9%0.2%
October 202556975.6%12.7%0.0%
November 202552663.3%20.5%5.3%
December 202548758.7%25.5%2.9%
January 202644567.0%20.4%2.0%
February 202644575.5%12.4%0.0%
March 202651654.3%26.6%5.6%
April 202655464.3%19.1%3.1%
May 202659671.5%17.1%1.2%
June 202658466.1%20.5%3.3%

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.

Airline26.7%
Late aircraft29.4%
National airspace37.8%
Weather6.0%
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.