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 3494 LANDED 7:33 AM ET, ~7 MIN LATE · SCHEDULED TIME UNKNOWN
Today

F9 3494 · LAS → IAD

took off 12:36 AM PT · landed 7:33 AM ET (scheduled time unknown)
Forecast issued Mon 3:00 PM ET · 11h after departure

Odds over time

Arrive at IAD more than 15 minutes late?
50% chance · ±0 pts – · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
LIVE IN THE AIR 0% 15% 30% 45% 60% 4h Departs Lands