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.

ALLEGIANT · FLIGHT G4 1641 LANDED 9:14 PM MT, ~2 MIN LATE · SCHEDULED TIME UNKNOWN

G4 1641 · LAS → BIL

took off 6:39 PM PT · landed 9:14 PM MT (scheduled time unknown)
Forecast issued Fri 10:00 PM ET · 0h before departure

Odds over time

Arrive at BIL more than 15 minutes late?
37% chance · ±1 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% 1h Departs Lands