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.

DELTA · FLIGHT DL 2840 LANDED 7:30 AM CT, ~11 MIN LATE · SCHEDULED TIME UNKNOWN

DL 2840 · DTW → ORD

took off 7:42 AM ET · landed 7:30 AM CT (scheduled time unknown)
Forecast issued Tue 10:00 PM ET · 14h after departure

Odds over time

Arrive at ORD more than 15 minutes late?
28% chance · ±0 pts −5 pts · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
LIVE IN THE AIR 0% 10% 20% 30% 40% 5h Departs Lands