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 1240 LANDED 12:57 AM CT, ~9 MIN LATE · SCHEDULED TIME UNKNOWN
Today

WN 1240 · CMH → BNA

took off 1:03 AM ET · landed 12:57 AM CT (scheduled time unknown)
Forecast issued Sat 5:00 AM ET · 4h after departure

Odds over time

Arrive at BNA more than 15 minutes late?
6% chance · ±0 pts −10 pts · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
MOSTLY HISTORY WEATHER FORECASTS LIVE IN THE AIR 0% 10% 20% 30% 40% 6.0d 2d 1d 12h 6h Departs Lands