Flight OddsUA4597 STL → ORD
United Airlines · St. Louis, MO to Chicago, IL · 87 flights observed, 2025-08-19 to 2026-01-05 · 258 mi
UA4597 covers more than one route in the data window — the stats below are for STL → ORD, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
70%
Median delay
-1 min
90th percentile
+78 min
Cancellation rate
0%
How often is UA4597 on time?
Across 87 flights on STL → ORD from 2025-08-19 to 2026-01-05, UA4597 arrived within 15 minutes of schedule 70% of the time. The median arrival delay was -1 min, and the worst 10% of flights arrived +78 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 | 60 | 70% |
| 16-30 min | 5 | 6% |
| 31-60 min | 6 | 7% |
| 61-120 min | 8 | 9% |
| 2+ hrs | 7 | 8% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-08 | 13 | 85% | +4 min |
| 2025-09 | 30 | 73% | +15 min |
| 2025-10 | 24 | 54% | +47 min |
| 2025-12 | 14 | 79% | -5 min |
| 2026-01 | 5 | 60% | +33 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 12 | 67% |
| Tue | 12 | 83% |
| Wed | 12 | 75% |
| Thu | 13 | 62% |
| Fri | 12 | 75% |
| Sat | 13 | 69% |
| Sun | 12 | 58% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…