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 581
SCHEDULED · TYPICAL SCHEDULE
Saturday, October 3
G4 581 · GRR → SFB
departs 7:00 AM ET · arrives 9:34 AM ET
Forecast issued Thu 3:00 AM ET · 52h before departure
Watch this flight
Other days
Sat 10/3
Wed 10/7 18%
Odds over time
Arrive at SFB more than 15 minutes late?
8%
chance · ±2 pts
– · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
8%
Leave 15+ late
7%
Arrive 1h+ late
6%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
5%
10%
15%
20%
4.4d
Now
1d
12h
6h
Departs
Lands
Arrive at SFB more than 15 minutes late?
Calm-weather odds: 7% · changed – in 24h
–
8%
Yes 8%
No 92%
Leave GRR more than 15 minutes late?
Calm-weather odds: 9% · changed – in 24h
–
7%
Yes 7%
No 93%
Arrive at SFB more than an hour late?
Calm-weather odds: 4% · changed – in 24h
–
6%
Yes 6%
No 94%
Cancelled?
Calm-weather odds: <1% · changed – in 24h
–
<1%
Yes <1%
No 99%
How late will it get to SFB?
On time or early
92%
15–30 min late
2%
30 min–1 hour late
0%
1–2 hours late
3%
Over 2 hours late
2%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
Other factors
↑
This flight has been late 18% of the time recently
↑
G4's recent on-time record
↓
Early flights usually leave on time
↓
Arrivals into SFB at that hour are usually not late
Weather at each end
GRR (origin)
Gusts 11 kt Ceiling none (clear) Visibility 10+ mi Precip none
SFB (destination)
Gusts 15 kt Ceiling 4,900 ft Visibility 10+ mi Precip 0.18 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.