Schedule: a typical summer Sunday (the flights of Jul 26, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
UNITED · FLIGHT UA 2131SCHEDULED · TYPICAL SCHEDULE
UA 2131 · SEA → IAD
departs 1:00 PM PT · arrives 9:06 PM ET
Forecast issued Fri 5:00 PM ET · 47h before departure
Odds over time
Arrive at IAD more than 15 minutes late?
24%chance · ±2 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
76%
15–30 min late
11%
30 min–1 hour late
8%
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%.