About 1 in 6 UA 4540 flights from Chattanooga arrived 15+ minutes late, diverted or cancelled over the past year (16%); 0.0% were cancelled. The typical flight landed 9 minutes early.
UA 4540: CHA → ORD
Scheduled to leave Chattanooga at 6:00 a.m. local time, operated by GoJet as G7 4540. Over the past year it arrived on time 84% of the time (158 flights), better than other UA flights on the route at that hour (81%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 23 | 91% |
| Tuesday | 22 | 91% |
| Wednesday | 22 | 82% |
| Thursday | 23 | 78% |
| Friday | 23 | 78% |
| Saturday | 23 | 78% |
| Sunday | 22 | 91% |
Why it was late
All flights CHA → ORD · Connecting off UA 4540? Check the risk
Questions
How often is UA 4540 from CHA to ORD late?
United Airlines 4540 from Chattanooga, TN to Chicago, IL arrived 15 or more minutes late, was diverted or was cancelled on 16% of 158 scheduled flights between September 2025 and August 2026. 0.0% were cancelled.
Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check United Airlines for today's flight. Method.