ORD to CHA flight delays
Chicago, IL (ORD) Chattanooga, TN (CHA) · 501 miles
954 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
70.23%
Arrived on time
Within 15 minutes of schedule
4.72%
Cancelled
Share of scheduled flights
79 min
When late, late by
Average across delayed arrivals
24 min
Delay per flight
Averaged over every flight flown
What the record says about this route
Cancellation, not delay, is the risk worth pricing here: 4.72% of scheduled flights never operated. A late flight still gets you there. A cancelled one leaves you rebooking, and on a route with few daily departures that can mean losing a day.
Which airline you fly changes the odds here. Envoy Air arrived on time 10.6 points more often than Republic Airways over the same period on the same route — same airports, same weather, same air traffic control. A gap that survives all of that is about how the two airlines are run.
The season swings this route hard. In August it ran 26.5 points more punctual than in February — a difference bigger than the one between the best and worst airlines on most routes. If the date is flexible, it is worth more than the carrier.
Flights from Chicago to Chattanooga run late more often than the average route, though not severely.
Which airline should you fly on this route?
Over January 2025 – August 2026, Envoy Air arrived on time most often on ORD to CHA. Republic Airways was late most often. Flights ran closest to schedule in August and worst in March.
Every airline on ORD to CHA
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| SkyWest Airlines | 510 | 69.02% | 5.29% | 78 min | F |
| Republic Airways | 239 | 66.67% | 4.6% | 83 min | F |
| Envoy Air | 205 | 77.27% | 3.41% | 78 min | D |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
CHA to ORD Chattanooga back to Chicago 70.23% on time FOther routes from Chicago
Common questions
Are flights from Chicago to Chattanooga usually delayed?
70.23% of flights on the ORD to CHA route arrived within 15 minutes of schedule, so roughly 3 in every ten arrived late. That is worse than the average route in this record.
Which airline is most on time from Chicago to Chattanooga?
Envoy Air, at 77.27% on time across 205 flights. The least punctual on the route was Republic Airways at 66.67%.
How often are ORD to CHA flights cancelled?
4.72% of scheduled flights did not operate — about 47 in every thousand. That is high enough that cancellation, not delay, is the risk worth planning around.
What is the best month to fly Chicago to Chattanooga?
August, when 88% of flights arrived on time. The worst was February at 61.5%.
When ORD to CHA flights are late, how late are they?
About 79 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on ORD to CHA during January 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →