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 2123SCHEDULED · TYPICAL SCHEDULE
Today
UA 2123 · DEN → SFO
departs 9:10 PM MT · arrives 10:56 PM PT
Forecast issued Fri 7:00 AM ET · 16h before departure
Odds over time
Arrive at SFO more than 15 minutes late?
17%chance · ±5 pts−2 pts · 24h
HOW SURE WE AREGood. The odds now lean mostly on firmed-up weather forecasts.
How late will it get to SFO?
On time or early
82%
15–30 min late
5%
30 min–1 hour late
7%
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%.