Schedule: a typical summer Friday (the flights of Jul 31, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
UNITED · FLIGHT UA 1665SCHEDULED · TYPICAL SCHEDULE
Tomorrow
UA 1665 · SFO → BOS
departs 11:05 PM PT · arrives 8:01 AM ET
Forecast issued Fri 1:00 AM ET · 25h before departure
Odds over time
Arrive at BOS more than 15 minutes late?
13%chance · ±1 pts−1 pt · 24h
HOW SURE WE AREModerate. The odds now blend history with early weather forecasts.
How late will it get to BOS?
On time or early
86%
15–30 min late
5%
30 min–1 hour late
5%
1–2 hours late
2%
Over 2 hours late
<1%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.