Schedule: a typical summer Sunday (the flights of Jul 26, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
ALLEGIANT · FLIGHT G4 639
SCHEDULED · TYPICAL SCHEDULE
Sunday, October 4 Today
G4 639 · AZA → GRI
departs 6:07 PM MT · arrives 10:27 PM CT
Forecast issued Sun 8:00 PM ET · 1h before departure
Watch this flight
Odds over time
Arrive at GRI more than 15 minutes late?
33%
chance · ±0 pts
−6 pts · 24h
HOW SURE WE ARE
High. The odds now come mostly from live FAA and airport data.
Arrive 15+ late
33%
Leave 15+ late
32%
Arrive 1h+ late
10%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
20%
40%
60%
80%
6.0d
2d
1d
12h
6h
Now
Departs
Lands
Arrive at GRI more than 15 minutes late?
Calm-weather odds: 33% · changed −6 pts in 24h
−6 pts
33%
Yes 33%
No 67%
Leave AZA more than 15 minutes late?
Calm-weather odds: 34% · changed +2 pts in 24h
+2 pts
32%
Yes 32%
No 68%
Arrive at GRI more than an hour late?
Calm-weather odds: 10% · changed −1 pt in 24h
−1 pt
10%
Yes 10%
No 90%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to GRI?
On time or early
66%
15–30 min late
17%
30 min–1 hour late
5%
1–2 hours late
8%
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
↑
Later flights pick up delays from earlier in the day
↑
G4's recent on-time record
↑
This flight has been late 21% of the time recently
↓
Mostly benign weather forecast at GRI
↓
Sundays in October are usually quieter than average
Weather at each end
AZA (origin)
Gusts 31 kt Ceiling none (clear) Visibility 10+ mi Precip none
GRI (destination)
Gusts 8 kt Ceiling none (clear) Visibility 10+ 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.