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 4203 LANDED 2:21 AM ET, ~60 MIN LATE · SCHEDULED TIME UNKNOWN
Yesterday

G4 4203 · LAR → GRR

took off 10:16 PM MT · landed 2:21 AM ET (scheduled time unknown)
Forecast issued Sat 10:00 PM ET · 1h before departure

Odds over time

Arrive at GRR more than 15 minutes late?
9% chance · ±1 pts – · 24h
HOW SURE WE ARE High. The odds now come mostly from live FAA and airport data.
LIVE IN THE AIR 0% 3% 6% 9% 12% Now Departs Lands