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 4659 LANDED 4:28 PM ET, ~5 MIN LATE · SCHEDULED TIME UNKNOWN
Today

YX 4659 · PIT → DCA

took off · landed 4:28 PM ET (scheduled time unknown)
Forecast issued Fri 8:00 PM ET · 4h after departure

Odds over time

Arrive at DCA more than 15 minutes late?
37% chance · ±0 pts +15 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% 1.2d 1d 12h 6h Departs Lands