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 1831SCHEDULED · TYPICAL SCHEDULE
Yesterday
UA 1831 · ATL → IAD
departs 2:41 PM ET · arrives 4:35 PM ET
Forecast issued Fri 10:00 PM ET · 7h after departure
Odds over time
Arrive at IAD more than 15 minutes late?
17%chance · ±0 pts+2 pts · 24h
HOW SURE WE AREVery high. The odds now come almost entirely from live conditions.
How late will it get to IAD?
On time or early
82%
15–30 min late
5%
30 min–1 hour late
6%
1–2 hours late
4%
Over 2 hours late
3%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.