Tracked live by the FAA, but its flight plan was first seen after takeoff, so we don't know the scheduled time and can't say whether it's late.

UNITED · FLIGHT UA 1322 LANDED 3:36 PM ET, ~23 MIN LATE · SCHEDULED TIME UNKNOWN

UA 1322 · SLC → IAD

took off 9:59 AM MT · landed 3:36 PM ET (scheduled time unknown)
Forecast issued Tue 10:00 PM ET · 10h after departure

Odds over time

Arrive at IAD more than 15 minutes late?
8% chance · ±0 pts −3 pts · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
WEATHER FORECASTS LIVE IN THE AIR 0% 5% 10% 15% 20% 21h 12h 6h Departs Lands