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 2129SCHEDULED · TYPICAL SCHEDULE
Tomorrow
UA 2129 · SAN → IAD
departs 9:59 PM PT · arrives 5:59 AM ET
Forecast issued Fri 6:00 AM ET · 43h before departure
Odds over time
Arrive at IAD more than 15 minutes late?
14%chance · ±1 pts+0 pts · 24h
HOW SURE WE AREModerate. The odds now blend history with early weather forecasts.
How late will it get to IAD?
On time or early
85%
15–30 min late
5%
30 min–1 hour late
5%
1–2 hours late
3%
Over 2 hours late
1%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.