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 3662 IN THE AIR (OFF 4:04 PM MT, ETA 5:00 PM MT) · SCHEDULED TIME UNKNOWN
Today

WN 3662 · SLC → DEN

took off 4:04 PM MT · expected to land 5:00 PM MT (scheduled time unknown)
Forecast issued Tue 4:00 PM ET · 2h before departure

Odds over time

Arrive at DEN more than 15 minutes late?
30% chance · ±3 pts −17 pts · 24h
HOW SURE WE ARE High. The odds now come mostly from live FAA and airport data.
WEATHER FORECASTS LIVE IN THE AIR 0% 20% 40% 60% 80% 1.1d 12h 6h Now Departs Lands