Flight OddsUA2040 BOS → ORD
United Airlines · Boston, MA to Chicago, IL · 361 flights observed, 2025-07-01 to 2026-06-30 · 867 mi
UA2040 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
53%
Median delay
+11 min
90th percentile
+76 min
Cancellation rate
2%
How often is UA2040 on time?
Across 361 flights on BOS → ORD from 2025-07-01 to 2026-06-30, UA2040 arrived within 15 minutes of schedule 53% of the time. The median arrival delay was +11 min, and the worst 10% of flights arrived +76 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 | 187 | 53% |
| 16-30 min | 66 | 19% |
| 31-60 min | 52 | 15% |
| 61-120 min | 23 | 7% |
| 2+ hrs | 24 | 7% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 29 | 34% | +56 min |
| 2025-08 | 30 | 53% | +27 min |
| 2025-09 | 30 | 40% | +44 min |
| 2025-10 | 31 | 45% | +27 min |
| 2025-11 | 28 | 61% | +27 min |
| 2025-12 | 30 | 53% | +26 min |
| 2026-01 | 27 | 44% | +12 min |
| 2026-02 | 27 | 63% | +5 min |
| 2026-03 | 30 | 53% | +34 min |
| 2026-04 | 30 | 57% | +10 min |
| 2026-05 | 31 | 81% | +20 min |
| 2026-06 | 29 | 52% | +43 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 49 | 49% |
| Tue | 52 | 65% |
| Wed | 52 | 48% |
| Thu | 50 | 56% |
| Fri | 50 | 44% |
| Sat | 49 | 57% |
| Sun | 50 | 52% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…