Schedule: a typical summer Saturday (the flights of Jul 25, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
UNITED · FLIGHT UA 1263SCHEDULED · TYPICAL SCHEDULE
Today
UA 1263 · ONT → DEN
departs 1:18 PM PT · arrives 4:38 PM MT
Forecast issued Sat 7:00 AM ET · 9h before departure
Odds over time
Arrive at DEN more than 15 minutes late?
26%chance · ±0 pts+11 pts · 24h
HOW SURE WE AREGood. The odds now lean mostly on firmed-up weather forecasts.
How late will it get to DEN?
On time or early
73%
15–30 min late
13%
30 min–1 hour late
3%
1–2 hours late
6%
Over 2 hours late
3%
Cancelled
2%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.