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 1991 LANDED 2:48 PM MT, ~10 MIN LATE · SCHEDULED TIME UNKNOWN
Today

WN 1991 · SAN → DEN

took off 12:04 PM PT · landed 2:48 PM MT (scheduled time unknown)
Forecast issued Tue 4:00 PM ET · 1h after departure

Odds over time

Arrive at DEN more than 15 minutes late?
31% chance · ±1 pts – · 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% 11h 6h Departs Now Lands