Schedule: a typical Saturday (the flights of Jul 25, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
UNITED · FLIGHT UA 643SCHEDULED · TYPICAL SCHEDULE
UA 643 · LAS → SFO
departs 6:00 AM PT · arrives 7:35 AM PT
Forecast issued Wed 11:00 AM ET · 70h before departure
Odds over time
Arrive at SFO more than 15 minutes late?
3%chance · ±1 pts– · 24h
HOW SURE WE AREModerate. The odds now blend history with early weather forecasts.
How late will it get to SFO?
On time or early
96%
15–30 min late
1%
30 min–1 hour late
<1%
1–2 hours late
<1%
Over 2 hours late
<1%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.