Schedule: a typical Thursday (the flights of Jul 30, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
ALLEGIANT · FLIGHT G4 577
SCHEDULED · TYPICAL SCHEDULE
Thursday, October 1 Today
G4 577 · PIE → GRR
departs 6:49 PM ET · arrives 9:24 PM ET
Forecast issued Thu 3:00 PM ET · 4h before departure
Watch this flight
Other days
Today
Sat 10/3 15%
Odds over time
Arrive at GRR more than 15 minutes late?
44%
chance · ±0 pts
−17 pts · 24h
HOW SURE WE ARE
High. The odds now come mostly from live FAA and airport data.
Arrive 15+ late
44%
Leave 15+ late
34%
Arrive 1h+ late
19%
Cancelled
2%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
25%
50%
75%
100%
2.8d
2d
1d
12h
6h
Now
Departs
Lands
Arrive at GRR more than 15 minutes late?
Calm-weather odds: 31% · changed −17 pts in 24h
−17 pts
44%
Yes 44%
No 56%
Leave PIE more than 15 minutes late?
Calm-weather odds: 35% · changed −23 pts in 24h
−23 pts
34%
Yes 34%
No 66%
Arrive at GRR more than an hour late?
Calm-weather odds: 16% · changed −20 pts in 24h
−20 pts
19%
Yes 19%
No 81%
Cancelled?
Calm-weather odds: <1% · changed −2 pts in 24h
−2 pts
2%
Yes 2%
No 98%
How late will it get to GRR?
On time or early
55%
15–30 min late
16%
30 min–1 hour late
8%
1–2 hours late
13%
Over 2 hours late
6%
Cancelled
2%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
0.3 in of rain, thunderstorms forecast at PIE that day
↑
Cloud base down to 700 ft, visibility down to 2 mi, 0.7 in of rain forecast at GRR that day
↑
Later flights pick up delays from earlier in the day
↓
GRR usually runs smoothly
↓
Thursdays in October are usually quieter than average
Weather at each end
PIE (origin)
Gusts 14 kt Ceiling 7,000 ft Visibility 10+ mi Precip 0.01 in
GRR (destination)
Gusts 12 kt Ceiling 800 ft Visibility 2 mi Precip 0.54 in
How this resolves
Yes if the gate arrival is more than 15 minutes after the scheduled arrival. Cancelled or diverted flights resolve N/A.
Every question here is display only — there is no betting or money involved. Gate times come from the airline; a cancellation resolves only the “Cancelled?” question, and a diversion voids the delay questions.