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.

MESA · FLIGHT YV 4038 LANDED 11:32 AM ET, ~10 MIN LATE · SCHEDULED TIME UNKNOWN

YV 4038 · LGA → IAD

took off 10:40 AM ET · landed 11:32 AM ET (scheduled time unknown)
Forecast issued Tue 10:00 PM ET · 11h after departure

Odds over time

Arrive at IAD more than 15 minutes late?
33% chance · ±0 pts +1 pt · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
LIVE IN THE AIR 0% 15% 30% 45% 60% 8h 6h Departs Lands