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 745 LANDED 8:15 PM MT, ~11 MIN LATE · SCHEDULED TIME UNKNOWN

WN 745 · LGB → SLC

took off 5:46 PM PT · landed 8:15 PM MT (scheduled time unknown)
Forecast issued Tue 10:00 PM ET · 1h after departure

Odds over time

Arrive at SLC more than 15 minutes late?
22% chance · ±0 pts −5 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