Flight OddsUA1639 STL → ORD
United Airlines · St. Louis, MO to Chicago, IL · 41 flights observed, 2026-05-21 to 2026-06-30 · 258 mi
UA1639 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
73%
Median delay
-2 min
90th percentile
+172 min
Cancellation rate
2%
How often is UA1639 on time?
Across 41 flights on STL → ORD from 2026-05-21 to 2026-06-30, UA1639 arrived within 15 minutes of schedule 73% of the time. The median arrival delay was -2 min, and the worst 10% of flights arrived +172 min or later. 2% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 29 | 73% |
| 16-30 min | 4 | 10% |
| 31-60 min | 1 | 3% |
| 61-120 min | 1 | 3% |
| 2+ hrs | 5 | 13% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-05 | 11 | 82% | -2 min |
| 2026-06 | 29 | 69% | +66 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 6 | 83% |
| Tue | 6 | 67% |
| Wed | 5 | 40% |
| Thu | 5 | 80% |
| Fri | 6 | 83% |
| Sat | 6 | 100% |
| Sun | 6 | 50% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…