Flight OddsUA2331 ORD → BOS
United Airlines · Chicago, IL to Boston, MA · 62 flights observed, 2026-04-30 to 2026-06-30 · 867 mi
UA2331 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
62%
Median delay
+8 min
90th percentile
+79 min
Cancellation rate
2%
How often is UA2331 on time?
Across 62 flights on ORD → BOS from 2026-04-30 to 2026-06-30, UA2331 arrived within 15 minutes of schedule 62% of the time. The median arrival delay was +8 min, and the worst 10% of flights arrived +79 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 | 38 | 62% |
| 16-30 min | 5 | 8% |
| 31-60 min | 7 | 11% |
| 61-120 min | 8 | 13% |
| 2+ hrs | 3 | 5% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-04 | 1 | 100% | +9 min |
| 2026-05 | 31 | 74% | +16 min |
| 2026-06 | 29 | 48% | +28 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 9 | 56% |
| Tue | 9 | 67% |
| Wed | 8 | 50% |
| Thu | 8 | 50% |
| Fri | 9 | 89% |
| Sat | 9 | 78% |
| Sun | 9 | 44% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…