Flight OddsUA351 ORD → BOS
United Airlines · Chicago, IL to Boston, MA · 26 flights observed, 2025-09-25 to 2025-10-24 · 867 mi
UA351 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
73%
Median delay
-3 min
90th percentile
+71 min
Cancellation rate
0%
How often is UA351 on time?
Across 26 flights on ORD → BOS from 2025-09-25 to 2025-10-24, UA351 arrived within 15 minutes of schedule 73% of the time. The median arrival delay was -3 min, and the worst 10% of flights arrived +71 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 | 19 | 73% |
| 16-30 min | 3 | 12% |
| 31-60 min | 0 | 0% |
| 61-120 min | 3 | 12% |
| 2+ hrs | 1 | 4% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-09 | 5 | 80% | +9 min |
| 2025-10 | 21 | 71% | +12 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 4 | 75% |
| Tue | 4 | 75% |
| Wed | 4 | 50% |
| Thu | 5 | 80% |
| Fri | 5 | 60% |
| Sat | No data | — |
| Sun | 4 | 100% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…