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 8505 LANDED 1:29 AM ET, ~1 MIN LATE · SCHEDULED TIME UNKNOWN
Today

WN 8505 · GSO → BWI

took off 12:43 AM ET · landed 1:29 AM ET (scheduled time unknown)
Forecast issued Mon 9:00 PM ET · 20h after departure

Odds over time

Arrive at BWI more than 15 minutes late?
25% chance · ±0 pts +0 pts · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
LIVE IN THE AIR 0% 10% 20% 30% 40% 2h Departs Lands