Flight OddsUA2256 SFO → BOS
United Airlines · San Francisco, CA to Boston, MA · 37 flights observed, 2026-01-06 to 2026-02-11 · 2,704 mi
UA2256 covers more than one route in the data window — the stats below are for SFO → BOS, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
86%
Median delay
-7 min
90th percentile
+31 min
Cancellation rate
3%
How often is UA2256 on time?
Across 37 flights on SFO → BOS from 2026-01-06 to 2026-02-11, UA2256 arrived within 15 minutes of schedule 86% of the time. The median arrival delay was -7 min, and the worst 10% of flights arrived +31 min or later. 3% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 31 | 86% |
| 16-30 min | 1 | 3% |
| 31-60 min | 1 | 3% |
| 61-120 min | 0 | 0% |
| 2+ hrs | 3 | 8% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-01 | 25 | 84% | +2 min |
| 2026-02 | 11 | 91% | +5 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 5 | 100% |
| Tue | 6 | 83% |
| Wed | 6 | 83% |
| Thu | 5 | 100% |
| Fri | 5 | 80% |
| Sat | 5 | 80% |
| Sun | 4 | 75% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…