Flight OddsUA2331 IAD → ORD
United Airlines · Washington, DC to Chicago, IL · 365 flights observed, 2025-07-01 to 2026-06-30 · 588 mi
UA2331 covers more than one route in the data window — the stats below are for IAD → ORD, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
81%
Median delay
-6 min
90th percentile
+48 min
Cancellation rate
1%
How often is UA2331 on time?
Across 365 flights on IAD → ORD from 2025-07-01 to 2026-06-30, UA2331 arrived within 15 minutes of schedule 81% of the time. The median arrival delay was -6 min, and the worst 10% of flights arrived +48 min or later. 1% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 291 | 81% |
| 16-30 min | 24 | 7% |
| 31-60 min | 17 | 5% |
| 61-120 min | 14 | 4% |
| 2+ hrs | 15 | 4% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 30 | 70% | +7 min |
| 2025-08 | 30 | 80% | +10 min |
| 2025-09 | 30 | 77% | +2 min |
| 2025-10 | 31 | 84% | +4 min |
| 2025-11 | 29 | 79% | +11 min |
| 2025-12 | 31 | 87% | +3 min |
| 2026-01 | 30 | 93% | -8 min |
| 2026-02 | 28 | 82% | +1 min |
| 2026-03 | 31 | 74% | +38 min |
| 2026-04 | 30 | 87% | +8 min |
| 2026-05 | 31 | 84% | +15 min |
| 2026-06 | 30 | 70% | +45 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 52 | 79% |
| Tue | 51 | 88% |
| Wed | 52 | 79% |
| Thu | 52 | 83% |
| Fri | 52 | 77% |
| Sat | 51 | 82% |
| Sun | 51 | 76% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…