Flight OddsUA4639 CHA → ORD
United Airlines · Chattanooga, TN to Chicago, IL · 64 flights observed, 2025-08-20 to 2025-10-25 · 501 mi
UA4639 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
84%
Median delay
-9 min
90th percentile
+42 min
Cancellation rate
0%
How often is UA4639 on time?
Across 64 flights on CHA → ORD from 2025-08-20 to 2025-10-25, UA4639 arrived within 15 minutes of schedule 84% of the time. The median arrival delay was -9 min, and the worst 10% of flights arrived +42 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 | 53 | 84% |
| 16-30 min | 2 | 3% |
| 31-60 min | 4 | 6% |
| 61-120 min | 0 | 0% |
| 2+ hrs | 4 | 6% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-08 | 12 | 100% | -15 min |
| 2025-09 | 26 | 77% | +27 min |
| 2025-10 | 25 | 84% | +4 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 9 | 78% |
| Tue | 9 | 89% |
| Wed | 10 | 80% |
| Thu | 10 | 100% |
| Fri | 10 | 80% |
| Sat | 9 | 78% |
| Sun | 6 | 83% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…