Flight OddsUA4557 ORD → STL
United Airlines · Chicago, IL to St. Louis, MO · 21 flights observed, 2026-04-30 to 2026-05-20 · 258 mi
UA4557 covers more than one route in the data window — the stats below are for ORD → STL, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
53%
Median delay
+15 min
90th percentile
+112 min
Cancellation rate
5%
How often is UA4557 on time?
Across 21 flights on ORD → STL from 2026-04-30 to 2026-05-20, UA4557 arrived within 15 minutes of schedule 53% of the time. The median arrival delay was +15 min, and the worst 10% of flights arrived +112 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 | 10 | 53% |
| 16-30 min | 2 | 11% |
| 31-60 min | 2 | 11% |
| 61-120 min | 4 | 21% |
| 2+ hrs | 1 | 5% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-04 | 1 | 100% | +15 min |
| 2026-05 | 18 | 50% | +31 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 2 | 50% |
| Tue | 3 | 33% |
| Wed | 3 | 67% |
| Thu | 3 | 67% |
| Fri | 3 | 33% |
| Sat | 2 | 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…