Schedule: a typical summer Saturday (the flights of Jul 25, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
ALLEGIANT · FLIGHT G4 321
SCHEDULED · TYPICAL SCHEDULE
Saturday, October 3 Yesterday
G4 321 · VPS → IAD
departs 5:03 PM CT · arrives 8:20 PM ET
Forecast issued Sat 10:00 PM ET · 4h after departure
Watch this flight
Odds over time
Arrive at IAD more than 15 minutes late?
31%
chance · ±1 pts
−6 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
31%
Leave 15+ late
31%
Arrive 1h+ late
13%
Cancelled
1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
4.8d
2d
1d
12h
6h
Departs
Lands
Arrive at IAD more than 15 minutes late?
Calm-weather odds: 33% · changed −6 pts in 24h
−6 pts
31%
Yes 31%
No 69%
Leave VPS more than 15 minutes late?
Calm-weather odds: 31% · changed −2 pts in 24h
−2 pts
31%
Yes 31%
No 69%
Arrive at IAD more than an hour late?
Calm-weather odds: 14% · changed −2 pts in 24h
−2 pts
13%
Yes 13%
No 87%
Cancelled?
Calm-weather odds: <1% · changed −1 pt in 24h
−1 pt
1%
Yes 1%
No 99%
How late will it get to IAD?
On time or early
68%
15–30 min late
7%
30 min–1 hour late
11%
1–2 hours late
7%
Over 2 hours late
5%
Cancelled
1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
Cloud base down to 500 ft, 0.6 in of rain forecast at VPS that day
↑
G4's recent on-time record
↑
5pm departures from VPS are often late
↓
VPS usually runs smoothly
↓
Saturdays in October are usually quieter than average
Weather at each end
VPS (origin)
Gusts 17 kt Ceiling 500 ft Visibility 9 mi Precip 0.18 in
IAD (destination)
Gusts 24 kt Ceiling 3,100 ft Visibility 9 mi Precip 0.22 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.