Flight OddsUA1531 ORD → BOS
United Airlines · Chicago, IL to Boston, MA · 37 flights observed, 2025-08-19 to 2025-09-24 · 867 mi
UA1531 covers more than one route in the data window — the stats below are for ORD → BOS, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
54%
Median delay
+10 min
90th percentile
+84 min
Cancellation rate
0%
How often is UA1531 on time?
Across 37 flights on ORD → BOS from 2025-08-19 to 2025-09-24, UA1531 arrived within 15 minutes of schedule 54% of the time. The median arrival delay was +10 min, and the worst 10% of flights arrived +84 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 | 20 | 54% |
| 16-30 min | 3 | 8% |
| 31-60 min | 4 | 11% |
| 61-120 min | 7 | 19% |
| 2+ hrs | 3 | 8% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-08 | 13 | 77% | +13 min |
| 2025-09 | 24 | 42% | +48 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 5 | 60% |
| Tue | 6 | 50% |
| Wed | 6 | 50% |
| Thu | 5 | 40% |
| Fri | 5 | 60% |
| Sat | 5 | 60% |
| Sun | 5 | 60% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…