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 988 LANDED 2:19 PM ET, ~2 MIN LATE · SCHEDULED TIME UNKNOWN

UA 988 · FRA → IAD

took off 12:29 PM CEST · landed 2:19 PM ET (scheduled time unknown)
Forecast issued Wed 10:00 PM ET · 16h after departure

Odds over time

Arrive at IAD more than 15 minutes late?
7% chance · ±0 pts +0 pts · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
WEATHER FORECASTS LIVE IN THE AIR 0% 3% 6% 9% 12% 1.0d 12h 6h Departs Lands