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 279 LANDED 8:56 AM PT, ~9 MIN LATE · SCHEDULED TIME UNKNOWN

WN 279 · PHX → LAS

took off 8:11 AM MT · landed 8:56 AM PT (scheduled time unknown)
Forecast issued Wed 10:00 PM ET · 11h after departure

Odds over time

Arrive at LAS more than 15 minutes late?
16% chance · ±0 pts −3 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 Departs Lands