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

Chicago, IL (ORD) to Decatur, IL (DEC) flight delay odds

66.5% of 626 official scheduled ORD-to-DEC flights arrived on time; 21.1% arrived at least 30 minutes late and 4.0% 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 SIGNALHigher disruption
66.5%arrived on time
21.1%30+ min late
4.0%cancelled
626scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late13.7%all scheduled flights
120+ minutes late6.5%all scheduled flights
Diverted0.3%did not reach as scheduled
Average arrival+20.2 mincompleted flights

Which departure time was most reliable for ORD to DEC?

Among qualifying ORD-to-DEC departure window results, Early morning had the highest on-time rate: 79.5% of 298 flights. Afternoon was lowest at 55.3% across 293 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning29879.5%11.1%2.0%
Afternoon29355.3%29.4%6.1%

Which weekday was most reliable for ORD to DEC?

Among qualifying ORD-to-DEC weekday results, Friday had the highest on-time rate: 76.0% of 104 flights. Sunday was lowest at 60.6% across 104 flights.

DayFlightsOn time30+ minCancelled
Monday10466.3%21.2%5.8%
Tuesday5660.7%28.6%1.8%
Wednesday10265.7%25.5%2.9%
Thursday10169.3%17.8%4.0%
Friday10476.0%15.4%1.9%
Saturday5561.8%25.5%7.3%
Sunday10460.6%19.2%4.8%

Which airline was most reliable for ORD to DEC?

Only SkyWest Airlines met the ORD-to-DEC airline threshold: 66.5% of 626 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
SkyWest Airlines62666.5%21.1%4.0%

Which month was most reliable for ORD to DEC?

Among qualifying ORD-to-DEC month results, October 2025 had the highest on-time rate: 87.0% of 54 flights. April 2026 was lowest at 48.1% across 52 flights.

MonthFlightsOn time30+ minCancelled
July 20255371.7%18.9%1.9%
August 20255373.6%18.9%1.9%
September 20255186.3%7.8%0.0%
October 20255487.0%11.1%0.0%
November 20255066.0%26.0%6.0%
December 20255556.4%32.7%5.5%
January 20265352.8%28.3%5.7%
February 20264868.8%22.9%0.0%
March 20265352.8%15.1%15.1%
April 20265248.1%28.8%5.8%
May 20265362.3%26.4%1.9%
June 20265172.5%15.7%3.9%

What drove ORD to DEC delay minutes?

Late aircraft was the largest recorded ORD-to-DEC delay category, accounting for 38.7% of 16,351 BTS-attributed delay minutes during July 2025–June 2026.

Airline34.6%
Late aircraft38.7%
National airspace21.4%
Weather5.4%
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.