Flight OddsUA4559 STL → ORD
United Airlines · St. Louis, MO to Chicago, IL · 31 flights observed, 2026-01-06 to 2026-02-11 · 258 mi
UA4559 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
48%
Median delay
+18 min
90th percentile
+92 min
Cancellation rate
0%
How often is UA4559 on time?
Across 31 flights on STL → ORD from 2026-01-06 to 2026-02-11, UA4559 arrived within 15 minutes of schedule 48% of the time. The median arrival delay was +18 min, and the worst 10% of flights arrived +92 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 | 15 | 48% |
| 16-30 min | 5 | 16% |
| 31-60 min | 4 | 13% |
| 61-120 min | 5 | 16% |
| 2+ hrs | 2 | 6% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-01 | 21 | 43% | +45 min |
| 2026-02 | 10 | 60% | +7 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 5 | 40% |
| Tue | 6 | 83% |
| Wed | 6 | 33% |
| Thu | 5 | 60% |
| Fri | 5 | 40% |
| Sat | No data | — |
| Sun | 4 | 25% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…