Flight OddsUnited Airlines · San Francisco, CA to Boston, MA · 343 flights observed, 2025-07-01 to 2026-06-30 · 2,704 mi
UA1665 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”.
How often is UA1665 on time?
Across 343 flights on SFO → BOS from 2025-07-01 to 2026-06-30, UA1665 arrived within 15 minutes of schedule 85% of the time. The median arrival delay was -12 min, and the worst 10% of flights arrived +26 min or later. 1% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 287 | 85% |
| 16-30 min | 22 | 6% |
| 31-60 min | 17 | 5% |
| 61-120 min | 11 | 3% |
| 2+ hrs | 2 | 1% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 31 | 94% | -4 min |
| 2025-08 | 31 | 94% | -5 min |
| 2025-09 | 30 | 90% | -4 min |
| 2025-10 | 31 | 87% | -12 min |
| 2025-11 | 30 | 77% | +2 min |
| 2025-12 | 28 | 82% | -4 min |
| 2026-01 | 20 | 75% | +2 min |
| 2026-02 | 21 | 86% | +4 min |
| 2026-03 | 30 | 77% | -6 min |
| 2026-04 | 26 | 92% | -16 min |
| 2026-05 | 31 | 84% | -11 min |
| 2026-06 | 30 | 77% | -6 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 45 | 84% |
| Tue | 47 | 91% |
| Wed | 44 | 82% |
| Thu | 50 | 84% |
| Fri | 52 | 87% |
| Sat | 51 | 86% |
| Sun | 50 | 78% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…