Flight OddsSTL → ORD United Airlines
United Airlines · St. Louis, MO to Chicago, IL · 3,018 flights, 2025-07-01 to 2026-06-30 · aggregated across 93 flight numbers
On-time arrival
71%
Median delay
-2 min
90th percentile
+82 min
Cancellation rate
3%
How on-time is United Airlines from STL to ORD?
Across every United Airlines flight number on STL → ORD (3,018 flights, 2025-07-01 to 2026-06-30), 71% arrived within 15 minutes of schedule. Median arrival delay -2 min; the worst 10% ran +82 min or later. 3% were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 2,069 | 71% |
| 16-30 min | 271 | 9% |
| 31-60 min | 227 | 8% |
| 61-120 min | 164 | 6% |
| 2+ hrs | 200 | 7% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 245 | 66% | +29 min |
| 2025-08 | 230 | 75% | +10 min |
| 2025-09 | 229 | 78% | +9 min |
| 2025-10 | 233 | 73% | +17 min |
| 2025-11 | 225 | 69% | +29 min |
| 2025-12 | 229 | 65% | +26 min |
| 2026-01 | 222 | 62% | +35 min |
| 2026-02 | 228 | 76% | +8 min |
| 2026-03 | 255 | 66% | +42 min |
| 2026-04 | 258 | 64% | +24 min |
| 2026-05 | 297 | 73% | +20 min |
| 2026-06 | 280 | 79% | +13 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 415 | 69% |
| Tue | 415 | 75% |
| Wed | 428 | 70% |
| Thu | 421 | 72% |
| Fri | 426 | 70% |
| Sat | 399 | 71% |
| Sun | 427 | 66% |
UA flight numbers on STL → ORD
Related
Based on US DOT Bureau of Transportation Statistics on-time data. Loading the full breakdown…