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.

REPUBLIC · FLIGHT YX 5779 LANDED 5:33 PM ET, ~3 MIN LATE · SCHEDULED TIME UNKNOWN

YX 5779 · JFK → IAD

took off 4:48 PM ET · landed 5:33 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?
20% chance · ±0 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% 10% 20% 30% 40% 1.1d 12h 6h Departs Lands