Flight OddsUA2004 SFO → BOS
United Airlines · San Francisco, CA to Boston, MA · 23 flights observed, 2025-10-26 to 2025-11-30 · 2,704 mi
UA2004 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
77%
Median delay
-12 min
90th percentile
+73 min
Cancellation rate
4%
How often is UA2004 on time?
Across 23 flights on SFO → BOS from 2025-10-26 to 2025-11-30, UA2004 arrived within 15 minutes of schedule 77% of the time. The median arrival delay was -12 min, and the worst 10% of flights arrived +73 min or later. 4% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 17 | 77% |
| 16-30 min | 0 | 0% |
| 31-60 min | 2 | 9% |
| 61-120 min | 2 | 9% |
| 2+ hrs | 1 | 5% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-10 | 3 | 33% | +98 min |
| 2025-11 | 19 | 84% | -2 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 4 | 75% |
| Tue | 1 | 100% |
| Wed | 1 | 100% |
| Thu | 4 | 25% |
| Fri | 4 | 75% |
| Sat | 2 | 100% |
| Sun | 6 | 100% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…