Flight OddsIAD → STL United Airlines
United Airlines · Washington, DC to St. Louis, MO · 719 flights, 2025-07-01 to 2026-06-30 · aggregated across 9 flight numbers
On-time arrival
77%
Median delay
-12 min
90th percentile
+102 min
Cancellation rate
1%
How on-time is United Airlines from IAD to STL?
Across every United Airlines flight number on IAD → STL (719 flights, 2025-07-01 to 2026-06-30), 77% arrived within 15 minutes of schedule. Median arrival delay -12 min; the worst 10% ran +102 min or later. 1% were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 546 | 77% |
| 16-30 min | 34 | 5% |
| 31-60 min | 32 | 4% |
| 61-120 min | 44 | 6% |
| 2+ hrs | 56 | 8% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 62 | 71% | +44 min |
| 2025-08 | 62 | 73% | +19 min |
| 2025-09 | 58 | 86% | -6 min |
| 2025-10 | 51 | 82% | +4 min |
| 2025-11 | 60 | 78% | +16 min |
| 2025-12 | 62 | 63% | +40 min |
| 2026-01 | 59 | 66% | +27 min |
| 2026-02 | 55 | 85% | +5 min |
| 2026-03 | 62 | 77% | +25 min |
| 2026-04 | 59 | 88% | -13 min |
| 2026-05 | 61 | 79% | +14 min |
| 2026-06 | 61 | 74% | +28 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 101 | 70% |
| Tue | 104 | 81% |
| Wed | 100 | 76% |
| Thu | 104 | 81% |
| Fri | 104 | 72% |
| Sat | 97 | 84% |
| Sun | 102 | 74% |
UA flight numbers on IAD → STL
Related
Based on US DOT Bureau of Transportation Statistics on-time data. Loading the full breakdown…