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 4554 LANDED 6:46 AM ET, ~9 MIN LATE · SCHEDULED TIME UNKNOWN
Yesterday

WN 4554 · CMH → BWI

took off 5:50 AM ET · landed 6:46 AM ET (scheduled time unknown)
Forecast issued Sat 10:00 PM ET · 16h after departure

Odds over time

Arrive at BWI more than 15 minutes late?
5% chance · ±0 pts +1 pt · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
LIVE IN THE AIR 0% 3% 6% 9% 12% 4h Departs Lands