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 4879 LANDED 4:19 PM ET, ~7 MIN LATE · SCHEDULED TIME UNKNOWN
Yesterday

WN 4879 · BNA → PHL

took off 1:54 PM CT · landed 4:19 PM ET (scheduled time unknown)
Forecast issued Sat 10:00 PM ET · 7h after departure

Odds over time

Arrive at PHL more than 15 minutes late?
56% 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% 20% 40% 60% 80% 11h 6h Departs Lands