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.

FRONTIER · FLIGHT F9 2225 LANDED 7:46 PM MT, ~18 MIN LATE · SCHEDULED TIME UNKNOWN
Yesterday

F9 2225 · RDU → DEN

took off 6:21 PM ET · landed 7:46 PM MT (scheduled time unknown)
Forecast issued Sat 10:00 PM ET · 4h after departure

Odds over time

Arrive at DEN more than 15 minutes late?
41% chance · ±0 pts +23 pts · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
MOSTLY HISTORY WEATHER FORECASTS LIVE IN THE AIR 0% 15% 30% 45% 60% 4.9d 2d 1d 12h 6h Departs Lands