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 304 LANDED 10:23 PM ET, ~8 MIN LATE · SCHEDULED TIME UNKNOWN
Yesterday

UA 304 · ORD → IAD

took off 8:07 PM CT · landed 10:23 PM ET (scheduled time unknown)
Forecast issued Sat 10:00 PM ET · 1h after departure

Odds over time

Arrive at IAD more than 15 minutes late?
31% chance · ±1 pts +11 pts · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
WEATHER FORECASTS LIVE IN THE AIR 0% 10% 20% 30% 40% 23h 12h 6h Departs Lands