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 1816 LANDED 10:24 PM ET, ~9 MIN LATE · SCHEDULED TIME UNKNOWN

WN 1816 · FLL → BWI

took off 7:55 PM ET · landed 10:24 PM ET (scheduled time unknown)
Forecast issued Fri 10:00 PM ET · 2h after departure

Odds over time

Arrive at BWI more than 15 minutes late?
42% chance · ±2 pts – · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
LIVE IN THE AIR 0% 20% 40% 60% 80% 1h Departs Lands