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 3021
SCHEDULED · TYPICAL SCHEDULE
Sunday, October 4
G4 3021 · TYS → SFB
departs 12:59 PM ET · arrives 2:34 PM ET
Forecast issued Fri 12:00 PM ET · 49h before departure
Watch this flight
Odds over time
Arrive at SFB more than 15 minutes late?
32%
chance · ±1 pts
+7 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
32%
Leave 15+ late
28%
Arrive 1h+ late
17%
Cancelled
1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
5.6d
Now
1d
12h
6h
Departs
Lands
Arrive at SFB more than 15 minutes late?
Calm-weather odds: 20% · changed +7 pts in 24h
+7 pts
32%
Yes 32%
No 68%
Leave TYS more than 15 minutes late?
Calm-weather odds: 20% · changed +0 pts in 24h
+0 pts
28%
Yes 28%
No 72%
Arrive at SFB more than an hour late?
Calm-weather odds: 6% · changed +5 pts in 24h
+5 pts
17%
Yes 17%
No 83%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
1%
Yes 1%
No 99%
How late will it get to SFB?
On time or early
67%
15–30 min late
13%
30 min–1 hour late
2%
1–2 hours late
14%
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 200 ft, visibility down to 0.3 mi, 1.3 in of rain forecast at TYS that day
↑
This flight has been late 20% of the time recently
↑
Mostly benign weather forecast at SFB
↓
TYS usually runs smoothly
↓
Sundays in October are usually quieter than average
Weather at each end
TYS (origin)
Gusts 7 kt Ceiling 200 ft Visibility 0.3 mi Precip 1.33 in
SFB (destination)
Gusts 13 kt Ceiling 9,000 ft Visibility 10+ mi Precip 0.23 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.