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.

SOUTHWEST · FLIGHT WN 1391 LANDED 8:34 PM ET, ~9 MIN LATE · SCHEDULED TIME UNKNOWN
Today

WN 1391 · BWI → RDU

took off 7:49 PM ET · landed 8:34 PM ET (scheduled time unknown)
Forecast issued Tue 9:00 PM ET · 1h after departure

Odds over time

Arrive at RDU more than 15 minutes late?
30% chance · ±0 pts +4 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% 24h 12h 6h Departs Lands Now