Flight OddsUA2331 ORD → PDX
United Airlines · Chicago, IL to Portland, OR · 47 flights observed, 2025-07-01 to 2025-12-17 · 1,739 mi
UA2331 covers more than one route in the data window — the stats below are for ORD → PDX, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
68%
Median delay
+3 min
90th percentile
+59 min
Cancellation rate
0%
How often is UA2331 on time?
Across 47 flights on ORD → PDX from 2025-07-01 to 2025-12-17, UA2331 arrived within 15 minutes of schedule 68% of the time. The median arrival delay was +3 min, and the worst 10% of flights arrived +59 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 | 32 | 68% |
| 16-30 min | 6 | 13% |
| 31-60 min | 4 | 9% |
| 61-120 min | 4 | 9% |
| 2+ hrs | 1 | 2% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 31 | 81% | +12 min |
| 2025-12 | 16 | 44% | +19 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 6 | 67% |
| Tue | 8 | 75% |
| Wed | 8 | 50% |
| Thu | 7 | 100% |
| Fri | 6 | 50% |
| Sat | 6 | 83% |
| 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…