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 4666 SCHEDULED · SCHEDULED TIME UNKNOWN
Today

WN 4666 · SJU → MCO

departs 5:50 AM AT · arrives 7:28 AM ET
Your aircraft is N8614M (B738), coming in as WN 4944 from MCO: landed 2:40 AM AT.
Forecast issued Tue 2:00 AM ET · 3h before departure

Odds over time

Arrive at MCO more than 15 minutes late?
10% chance · ±0 pts – · 24h
HOW SURE WE ARE High. The odds now come mostly from live FAA and airport data.
WEATHER FORECASTS LIVE IN THE AIR 0% 3% 6% 9% 12% 2.2d 1d 12h 6h Now Departs Lands