Flight OddsUA390 BOS → SFO
United Airlines · Boston, MA to San Francisco, CA · 37 flights observed, 2025-08-19 to 2025-09-24 · 2,704 mi
UA390 covers more than one route in the data window — the stats below are for BOS → SFO, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
89%
Median delay
-12 min
90th percentile
+18 min
Cancellation rate
0%
How often is UA390 on time?
Across 37 flights on BOS → SFO from 2025-08-19 to 2025-09-24, UA390 arrived within 15 minutes of schedule 89% of the time. The median arrival delay was -12 min, and the worst 10% of flights arrived +18 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 | 33 | 89% |
| 16-30 min | 1 | 3% |
| 31-60 min | 2 | 5% |
| 61-120 min | 1 | 3% |
| 2+ hrs | 0 | 0% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-08 | 13 | 85% | -7 min |
| 2025-09 | 24 | 92% | -7 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 5 | 80% |
| Tue | 6 | 100% |
| Wed | 6 | 100% |
| Thu | 5 | 80% |
| Fri | 5 | 80% |
| Sat | 5 | 80% |
| Sun | 5 | 100% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…