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.

FRONTIER · FLIGHT F9 1375 LANDED 7:21 AM MT, ~19 MIN LATE · SCHEDULED TIME UNKNOWN
Yesterday

F9 1375 · DEN → PHX

took off 6:58 AM MT · landed 7:21 AM MT (scheduled time unknown)
Forecast issued Sat 10:00 PM ET · 13h after departure

Odds over time

Arrive at PHX more than 15 minutes late?
22% chance · ±0 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