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 1622 LANDED 4:32 PM ET, ~10 MIN LATE · SCHEDULED TIME UNKNOWN
Today

WN 1622 · DEN → PHL

took off 11:22 AM MT · landed 4:32 PM ET (scheduled time unknown)
Forecast issued Tue 4:00 PM ET · 3h after departure

Odds over time

Arrive at PHL more than 15 minutes late?
35% chance · ±1 pts – · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
LIVE IN THE AIR 0% 15% 30% 45% 60% 9h 6h Departs Lands