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 3308 LANDED 12:33 AM MT, ~8 MIN LATE · SCHEDULED TIME UNKNOWN
Today

WN 3308 · DEN → PHX

took off 12:07 AM MT · landed 12:33 AM MT (scheduled time unknown)
Forecast issued Mon 8:00 PM ET · 18h after departure

Odds over time

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