Flight OddsUA1531 ORD → PDX
United Airlines · Chicago, IL to Portland, OR · 82 flights observed, 2026-02-12 to 2026-05-20 · 1,739 mi
UA1531 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
64%
Median delay
+8 min
90th percentile
+52 min
Cancellation rate
2%
How often is UA1531 on time?
Across 82 flights on ORD → PDX from 2026-02-12 to 2026-05-20, UA1531 arrived within 15 minutes of schedule 64% of the time. The median arrival delay was +8 min, and the worst 10% of flights arrived +52 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 | 51 | 64% |
| 16-30 min | 12 | 15% |
| 31-60 min | 11 | 14% |
| 61-120 min | 2 | 3% |
| 2+ hrs | 4 | 5% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-02 | 11 | 64% | +19 min |
| 2026-03 | 24 | 58% | +30 min |
| 2026-04 | 25 | 56% | +21 min |
| 2026-05 | 20 | 80% | +14 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 9 | 56% |
| Tue | 10 | 80% |
| Wed | 10 | 40% |
| Thu | 13 | 62% |
| Fri | 13 | 46% |
| Sat | 14 | 93% |
| Sun | 11 | 64% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…