Flight OddsUA4390 ORD → CHA
United Airlines · Chicago, IL to Chattanooga, TN · 18 flights observed, 2025-08-01 to 2025-08-18 · 501 mi
UA4390 covers more than one route in the data window — the stats below are for ORD → CHA, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
71%
Median delay
-6 min
90th percentile
+95 min
Cancellation rate
6%
How often is UA4390 on time?
Across 18 flights on ORD → CHA from 2025-08-01 to 2025-08-18, UA4390 arrived within 15 minutes of schedule 71% of the time. The median arrival delay was -6 min, and the worst 10% of flights arrived +95 min or later. 6% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 12 | 71% |
| 16-30 min | 2 | 12% |
| 31-60 min | 0 | 0% |
| 61-120 min | 2 | 12% |
| 2+ hrs | 1 | 6% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-08 | 17 | 71% | +19 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 3 | 100% |
| Tue | 1 | 0% |
| Wed | 2 | 100% |
| Thu | 2 | 50% |
| Fri | 3 | 67% |
| Sat | 3 | 100% |
| Sun | 3 | 33% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…