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 1271 IN THE AIR (OFF 4:06 PM CT, ETA 4:42 PM MT) · SCHEDULED TIME UNKNOWN
Today

WN 1271 · DAL → DEN

took off 4:06 PM CT · expected to land 4:42 PM MT (scheduled time unknown)
Forecast issued Tue 4:00 PM ET · 1h before departure

Odds over time

Arrive at DEN more than 15 minutes late?
33% chance · ±2 pts −21 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