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 3348 LANDED 7:39 AM MT, ~9 MIN LATE · SCHEDULED TIME UNKNOWN
Yesterday

WN 3348 · RDU → DEN

took off 6:38 AM ET · landed 7:39 AM MT (scheduled time unknown)
Forecast issued Wed 10:00 PM ET · 15h after departure

Odds over time

Arrive at DEN more than 15 minutes late?
6% chance · ±0 pts −18 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