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 1423 LANDED 3:35 PM PT, ~8 MIN LATE · SCHEDULED TIME UNKNOWN

WN 1423 · RNO → LAS

took off 2:37 PM PT · landed 3:35 PM PT (scheduled time unknown)
Forecast issued Tue 10:00 PM ET · 4h after departure

Odds over time

Arrive at LAS more than 15 minutes late?
56% chance · ±0 pts – · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
WEATHER FORECASTS LIVE IN THE AIR 0% 25% 50% 75% 100% 14h 12h 6h Departs Lands