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

Chicago, IL (ORD) to Chattanooga, TN (CHA) flight delay odds

66.8% of 954 official scheduled ORD-to-CHA flights arrived on time; 18.9% arrived at least 30 minutes late and 4.7% 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
66.8%arrived on time
18.9%30+ min late
4.7%cancelled
954scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late11.2%all scheduled flights
120+ minutes late4.4%all scheduled flights
Diverted0.2%did not reach as scheduled
Average arrival+15.0 mincompleted flights

Which departure time was most reliable for ORD to CHA?

Among qualifying ORD-to-CHA departure window results, Early morning had the highest on-time rate: 70.4% of 81 flights. Night was lowest at 54.5% across 44 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning8170.4%19.8%4.9%
Late morning11167.6%15.3%6.3%
Afternoon33768.5%18.1%3.0%
Evening38165.6%20.5%4.5%
Night4454.5%18.2%15.9%

Which weekday was most reliable for ORD to CHA?

Among qualifying ORD-to-CHA weekday results, Tuesday had the highest on-time rate: 71.9% of 128 flights. Sunday was lowest at 55.6% across 144 flights.

DayFlightsOn time30+ minCancelled
Monday14264.8%19.7%8.5%
Tuesday12871.9%13.3%2.3%
Wednesday15070.0%17.3%2.7%
Thursday14469.4%20.1%4.2%
Friday14468.8%20.1%5.6%
Saturday10267.6%16.7%4.9%
Sunday14455.6%23.6%4.9%

Which airline was most reliable for ORD to CHA?

Among qualifying ORD-to-CHA airline results, Envoy Air had the highest on-time rate: 74.6% of 205 flights. Republic Airways was lowest at 63.6% across 239 flights.

AirlineFlightsOn time30+ minCancelled
SkyWest Airlines51065.1%19.2%5.3%
Republic Airways23963.6%19.7%4.6%
Envoy Air20574.6%17.1%3.4%

Which month was most reliable for ORD to CHA?

Among qualifying ORD-to-CHA month results, August 2025 had the highest on-time rate: 88.0% of 25 flights. March 2026 was lowest at 56.1% across 157 flights.

MonthFlightsOn time30+ minCancelled
July 20252972.4%20.7%0.0%
August 20252588.0%8.0%0.0%
September 20255978.0%18.6%0.0%
October 202513269.7%15.9%0.8%
November 202511863.6%11.9%8.5%
December 20256160.7%31.1%4.9%
January 20265770.2%15.8%5.3%
February 20267861.5%23.1%0.0%
March 202615756.1%28.0%8.9%
April 202615268.4%15.1%7.2%
May 20265381.1%11.3%1.9%
June 20263363.6%21.2%6.1%

What drove ORD to CHA delay minutes?

Airline was the largest recorded ORD-to-CHA delay category, accounting for 41.4% of 21,432 BTS-attributed delay minutes during July 2025–June 2026.

Airline41.4%
Late aircraft28.0%
National airspace17.8%
Weather12.8%
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.