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 · SFO → SNA
departs 10:10 AM PT · arrives 11:50 AM PT
Forecast issued Thu 3:00 AM ET · 58h before departure
Odds over time
Arrive at SNA more than 15 minutes late?
14%chance · ±0 pts– · 24h
HOW SURE WE AREModerate. The odds now blend history with early weather forecasts.
How late will it get to SNA?
On time or early
85%
15–30 min late
6%
30 min–1 hour late
4%
1–2 hours late
3%
Over 2 hours late
2%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.