Flight OddsUA4537 STL → ORD
United Airlines · St. Louis, MO to Chicago, IL · 17 flights observed, 2026-03-06 to 2026-03-28 · 258 mi
UA4537 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
82%
Median delay
-9 min
90th percentile
+83 min
Cancellation rate
0%
How often is UA4537 on time?
Across 17 flights on STL → ORD from 2026-03-06 to 2026-03-28, UA4537 arrived within 15 minutes of schedule 82% of the time. The median arrival delay was -9 min, and the worst 10% of flights arrived +83 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 | 14 | 82% |
| 16-30 min | 0 | 0% |
| 31-60 min | 1 | 6% |
| 61-120 min | 0 | 0% |
| 2+ hrs | 2 | 12% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-03 | 17 | 82% | +30 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | No data | — |
| Tue | No data | — |
| Wed | 3 | 100% |
| Thu | 3 | 100% |
| Fri | 4 | 75% |
| Sat | 4 | 75% |
| Sun | 3 | 67% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…