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.

UNITED · FLIGHT UA 2015 LANDED 5:47 PM MT, ~12 MIN LATE · SCHEDULED TIME UNKNOWN

UA 2015 · ORD → PHX

took off 4:14 PM CT · landed 5:47 PM MT (scheduled time unknown)
Forecast issued Tue 10:00 PM ET · 5h after departure

Odds over time

Arrive at PHX more than 15 minutes late?
46% chance · ±0 pts +9 pts · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
WEATHER FORECASTS LIVE IN THE AIR 0% 15% 30% 45% 60% 1.1d 12h 6h Departs Lands Now