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 4863 IN THE AIR (OFF 11:16 AM PT, ETA 12:33 PM MT) · SCHEDULED TIME UNKNOWN
Today

WN 4863 · RNO → PHX

took off 11:16 AM PT · expected to land 12:33 PM MT (scheduled time unknown)
Forecast issued Mon 2:00 PM ET · 0h before departure

Odds over time

Arrive at PHX more than 15 minutes late?
20% chance · ±0 pts +10 pts · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
WEATHER FORECASTS LIVE IN THE AIR 0% 10% 20% 30% 40% 1.0d 12h 6h Now Departs Lands