Flight OddsUA1278 ORD → BOS
United Airlines · Chicago, IL to Boston, MA · 12 flights observed, 2026-04-30 to 2026-05-18 · 867 mi
UA1278 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
42%
Median delay
+19 min
90th percentile
+193 min
Cancellation rate
0%
How often is UA1278 on time?
Across 12 flights on ORD → BOS from 2026-04-30 to 2026-05-18, UA1278 arrived within 15 minutes of schedule 42% of the time. The median arrival delay was +19 min, and the worst 10% of flights arrived +193 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 | 5 | 42% |
| 16-30 min | 3 | 25% |
| 31-60 min | 1 | 8% |
| 61-120 min | 1 | 8% |
| 2+ hrs | 2 | 17% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-04 | 1 | 0% | +20 min |
| 2026-05 | 11 | 45% | +50 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 3 | 33% |
| Tue | No data | — |
| Wed | No data | — |
| Thu | 3 | 33% |
| Fri | 3 | 33% |
| Sat | No data | — |
| Sun | 3 | 67% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…