Flight OddsUA1129 ORD → BOS
United Airlines · Chicago, IL to Boston, MA · 48 flights observed, 2025-07-01 to 2025-08-18 · 867 mi
UA1129 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
49%
Median delay
+19 min
90th percentile
+128 min
Cancellation rate
6%
How often is UA1129 on time?
Across 48 flights on ORD → BOS from 2025-07-01 to 2025-08-18, UA1129 arrived within 15 minutes of schedule 49% of the time. The median arrival delay was +19 min, and the worst 10% of flights arrived +128 min or later. 6% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 22 | 49% |
| 16-30 min | 4 | 9% |
| 31-60 min | 9 | 20% |
| 61-120 min | 4 | 9% |
| 2+ hrs | 6 | 13% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 29 | 45% | +44 min |
| 2025-08 | 16 | 56% | +28 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 6 | 67% |
| Tue | 6 | 50% |
| Wed | 7 | 43% |
| Thu | 7 | 43% |
| Fri | 6 | 83% |
| Sat | 7 | 43% |
| Sun | 6 | 17% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…