Flight OddsUA366 BOS → ORD
United Airlines · Boston, MA to Chicago, IL · 58 flights observed, 2025-09-25 to 2026-06-24 · 867 mi
UA366 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
-6 min
90th percentile
+8 min
Cancellation rate
2%
How often is UA366 on time?
Across 58 flights on BOS → ORD from 2025-09-25 to 2026-06-24, UA366 arrived within 15 minutes of schedule 95% of the time. The median arrival delay was -6 min, and the worst 10% of flights arrived +8 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 | 54 | 95% |
| 16-30 min | 1 | 2% |
| 31-60 min | 1 | 2% |
| 61-120 min | 1 | 2% |
| 2+ hrs | 0 | 0% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-09 | 5 | 100% | -10 min |
| 2025-10 | 18 | 94% | -1 min |
| 2026-05 | 11 | 82% | +7 min |
| 2026-06 | 23 | 100% | -8 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 9 | 100% |
| Tue | 5 | 100% |
| Wed | 5 | 100% |
| Thu | 10 | 100% |
| Fri | 9 | 89% |
| Sat | 10 | 90% |
| Sun | 9 | 89% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…