Flight OddsUA1857 BOS → ORD
United Airlines · Boston, MA to Chicago, IL · 21 flights observed, 2025-07-03 to 2025-07-31 · 867 mi
UA1857 covers more than one route in the data window — the stats below are for BOS → ORD, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
95%
Median delay
-12 min
90th percentile
+5 min
Cancellation rate
0%
How often is UA1857 on time?
Across 21 flights on BOS → ORD from 2025-07-03 to 2025-07-31, UA1857 arrived within 15 minutes of schedule 95% of the time. The median arrival delay was -12 min, and the worst 10% of flights arrived +5 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 | 95% |
| 16-30 min | 0 | 0% |
| 31-60 min | 1 | 5% |
| 61-120 min | 0 | 0% |
| 2+ hrs | 0 | 0% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 21 | 95% | -10 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 4 | 100% |
| Tue | No data | — |
| Wed | No data | — |
| Thu | 5 | 100% |
| Fri | 4 | 100% |
| Sat | 4 | 100% |
| Sun | 4 | 75% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…