Schedule: a typical Saturday (the flights of Jul 25, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
ALLEGIANT · FLIGHT G4 577
SCHEDULED · TYPICAL SCHEDULE
Saturday, October 3
G4 577 · PIE → GRR
departs 11:00 AM ET · arrives 1:35 PM ET
Forecast issued Thu 5:00 PM ET · 42h before departure
Watch this flight
Other days
Today 55%
Sat 10/3
Odds over time
Arrive at GRR more than 15 minutes late?
15%
chance · ±1 pts
+0 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
15%
Leave 15+ late
16%
Arrive 1h+ late
9%
Cancelled
1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
4.5d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at GRR more than 15 minutes late?
Calm-weather odds: 10% · changed +0 pts in 24h
+0 pts
15%
Yes 15%
No 85%
Leave PIE more than 15 minutes late?
Calm-weather odds: 11% · changed +0 pts in 24h
+0 pts
16%
Yes 16%
No 84%
Arrive at GRR more than an hour late?
Calm-weather odds: 3% · changed −1 pt in 24h
−1 pt
9%
Yes 9%
No 91%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
1%
Yes 1%
No 99%
How late will it get to GRR?
On time or early
84%
15–30 min late
1%
30 min–1 hour late
5%
1–2 hours late
6%
Over 2 hours late
3%
Cancelled
1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
0.3 in of rain forecast at PIE that day
↑
Other factors
↑
This flight has been late 31% of the time recently
↓
GRR usually runs smoothly
↓
Mostly benign weather forecast at GRR
Weather at each end
PIE (origin)
Gusts 13 kt Ceiling 5,000 ft Visibility 10+ mi Precip 0.34 in
GRR (destination)
Gusts 12 kt Ceiling none (clear) Visibility 8 mi Precip none
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.