Flight OddsUA4389 STL → ORD
United Airlines · St. Louis, MO to Chicago, IL · 37 flights observed, 2026-01-06 to 2026-02-11 · 258 mi
UA4389 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
66%
Median delay
-1 min
90th percentile
+99 min
Cancellation rate
5%
How often is UA4389 on time?
Across 37 flights on STL → ORD from 2026-01-06 to 2026-02-11, UA4389 arrived within 15 minutes of schedule 66% of the time. The median arrival delay was -1 min, and the worst 10% of flights arrived +99 min or later. 5% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 23 | 66% |
| 16-30 min | 6 | 17% |
| 31-60 min | 2 | 6% |
| 61-120 min | 0 | 0% |
| 2+ hrs | 4 | 11% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-01 | 24 | 50% | +73 min |
| 2026-02 | 11 | 100% | -12 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 5 | 60% |
| Tue | 6 | 50% |
| Wed | 6 | 67% |
| Thu | 5 | 60% |
| Fri | 5 | 80% |
| Sat | 4 | 75% |
| Sun | 4 | 75% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…