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 1850 LANDED 5:58 PM CT, ~5 MIN LATE · SCHEDULED TIME UNKNOWN

UA 1850 · ATL → ORD

took off 5:24 PM ET · landed 5:58 PM CT (scheduled time unknown)
Forecast issued Tue 10:00 PM ET · 5h after departure

Odds over time

Arrive at ORD more than 15 minutes late?
48% chance · ±0 pts +13 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