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.

COMMUTEAIR · FLIGHT C5 4959 SCHEDULED · SCHEDULED TIME UNKNOWN
Today

C5 4959 · GSP → IAD

departs 8:12 AM ET · arrives 9:29 AM ET
Your aircraft is N17146 (E145), coming in as C5 4962 from IAD: landed 2:51 PM ET.
Forecast issued Sat 3:00 AM ET · 5h before departure

Odds over time

Arrive at IAD more than 15 minutes late?
12% chance · ±0 pts – · 24h
HOW SURE WE ARE High. The odds now come mostly from live FAA and airport data.
WEATHER FORECASTS LIVE IN THE AIR 0% 10% 20% 30% 40% 13h 6h Now Departs Lands