Flight OddsUA4540 CHA → ORD
United Airlines · Chattanooga, TN to Chicago, IL · 107 flights observed, 2025-08-19 to 2026-06-30 · 501 mi
UA4540 covers more than one route in the data window — the stats below are for CHA → ORD, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
85%
Median delay
-8 min
90th percentile
+21 min
Cancellation rate
0%
How often is UA4540 on time?
Across 107 flights on CHA → ORD from 2025-08-19 to 2026-06-30, UA4540 arrived within 15 minutes of schedule 85% of the time. The median arrival delay was -8 min, and the worst 10% of flights arrived +21 min or later. 0% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 91 | 85% |
| 16-30 min | 6 | 6% |
| 31-60 min | 4 | 4% |
| 61-120 min | 3 | 3% |
| 2+ hrs | 3 | 3% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-08 | 11 | 91% | -4 min |
| 2025-09 | 30 | 87% | -3 min |
| 2025-10 | 25 | 84% | +7 min |
| 2026-05 | 11 | 91% | -1 min |
| 2026-06 | 30 | 80% | +11 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 15 | 100% |
| Tue | 16 | 88% |
| Wed | 15 | 93% |
| Thu | 16 | 63% |
| Fri | 16 | 88% |
| Sat | 14 | 64% |
| Sun | 15 | 100% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…