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 1017 LANDED 9:01 PM ET, ~15 MIN LATE · SCHEDULED TIME UNKNOWN

UA 1017 · PHX → IAD

took off 2:11 PM MT · landed 9:01 PM ET (scheduled time unknown)
Forecast issued Tue 10:00 PM ET · 5h after departure

Odds over time

Arrive at IAD more than 15 minutes late?
31% chance · ±1 pts −2 pts · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
WEATHER FORECASTS LIVE IN THE AIR 0% 15% 30% 45% 60% 1.1d 12h 6h Departs Lands