Schedule: a typical summer Wednesday (the flights of Jul 29, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
ALLEGIANT · FLIGHT G4 537
SCHEDULED · TYPICAL SCHEDULE
Wednesday, September 30
G4 537 · SNA → GRR
departs 12:19 PM PT · arrives 7:24 PM ET
Forecast issued Wed 10:00 PM ET · 7h after departure
Watch this flight
Odds over time
Arrive at GRR more than 15 minutes late?
26%
chance · ±0 pts
+0 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
26%
Leave 15+ late
24%
Arrive 1h+ late
7%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
2.8d
2d
1d
12h
6h
Departs
Lands
Arrive at GRR more than 15 minutes late?
Calm-weather odds: 26% · changed +0 pts in 24h
+0 pts
26%
Yes 26%
No 74%
Leave SNA more than 15 minutes late?
Calm-weather odds: 24% · changed +2 pts in 24h
+2 pts
24%
Yes 24%
No 76%
Arrive at GRR more than an hour late?
Calm-weather odds: 6% · changed +0 pts in 24h
+0 pts
7%
Yes 7%
No 93%
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
73%
15–30 min late
15%
30 min–1 hour late
4%
1–2 hours late
4%
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
↑
Cloud base down to 600 ft, visibility down to 1.25 mi, 0.4 in of rain forecast at GRR that day
↑
SNA is prone to delays
↑
G4's recent on-time record
↓
GRR usually runs smoothly
↓
Wednesdays in September are usually quieter than average
Weather at each end
SNA (origin)
Gusts 13 kt Ceiling 1,600 ft Visibility 10+ mi Precip none
GRR (destination)
Gusts 11 kt Ceiling 600 ft Visibility 1.25 mi Precip 0.35 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.