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 1945 LANDED 7:03 AM ET, ~11 MIN LATE · SCHEDULED TIME UNKNOWN
Today

WN 1945 · GRR → BWI

took off 5:45 AM ET · landed 7:03 AM ET (scheduled time unknown)
Forecast issued Sat 3:00 PM ET · 9h after departure

Odds over time

Arrive at BWI more than 15 minutes late?
9% chance · ±0 pts – · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
LIVE IN THE AIR 0% 5% 10% 15% 20% 3h Departs Lands