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 3512 LANDED 3:11 AM ET, ~6 MIN LATE · SCHEDULED TIME UNKNOWN
Today

WN 3512 · MIA → CMH

took off 1:06 AM ET · landed 3:11 AM ET (scheduled time unknown)
Forecast issued Tue 6:00 AM ET · 5h after departure

Odds over time

Arrive at CMH more than 15 minutes late?
19% chance · ±0 pts – · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
WEATHER FORECASTS LIVE IN THE AIR 0% 25% 50% 75% 100% 2.0d 1d 12h 6h Departs Lands