Flight OddsUA2104 ORD → BOS
United Airlines · Chicago, IL to Boston, MA · 134 flights observed, 2025-07-03 to 2026-04-29 · 867 mi
UA2104 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
95%
Median delay
-13 min
90th percentile
+4 min
Cancellation rate
0%
How often is UA2104 on time?
Across 134 flights on ORD → BOS from 2025-07-03 to 2026-04-29, UA2104 arrived within 15 minutes of schedule 95% of the time. The median arrival delay was -13 min, and the worst 10% of flights arrived +4 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 | 127 | 95% |
| 16-30 min | 4 | 3% |
| 31-60 min | 1 | 1% |
| 61-120 min | 0 | 0% |
| 2+ hrs | 2 | 1% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 21 | 90% | -9 min |
| 2025-08 | 23 | 96% | -8 min |
| 2025-09 | 21 | 90% | +1 min |
| 2025-10 | 22 | 100% | -12 min |
| 2025-11 | 19 | 100% | -10 min |
| 2025-12 | 1 | 0% | +28 min |
| 2026-03 | 2 | 100% | -25 min |
| 2026-04 | 25 | 96% | -13 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 26 | 92% |
| Tue | 1 | 100% |
| Wed | 6 | 100% |
| Thu | 26 | 92% |
| Fri | 25 | 92% |
| Sat | 23 | 96% |
| Sun | 27 | 100% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…