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 2321 LANDED 10:26 PM MT, ~13 MIN LATE · SCHEDULED TIME UNKNOWN

UA 2321 · EWR → PHX

took off 8:36 PM ET · landed 10:26 PM MT (scheduled time unknown)
Forecast issued Tue 10:00 PM ET · 1h after departure

Odds over time

Arrive at PHX more than 15 minutes late?
53% chance · ±1 pts +13 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% 1.0d 12h 6h Departs Lands