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 3349 LANDED 6:51 PM MT, ~7 MIN LATE · SCHEDULED TIME UNKNOWN

WN 3349 · RDU → DEN

took off 5:37 PM ET · landed 6:51 PM MT (scheduled time unknown)
Forecast issued Tue 10:00 PM ET · 4h after departure

Odds over time

Arrive at DEN more than 15 minutes late?
31% chance · ±1 pts −1 pt · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
WEATHER FORECASTS LIVE IN THE AIR 0% 15% 30% 45% 60% 1.1d 12h 6h Departs Lands Now