Schedule: a typical summer Monday (the flights of Jul 27, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
ALLEGIANT · FLIGHT G4 1239
SCHEDULED · TYPICAL SCHEDULE
Monday, October 5 Tomorrow
G4 1239 · PIT → SFB
departs 9:18 PM ET · arrives 11:27 PM ET
Forecast issued Sun 4:00 AM ET · 41h before departure
Watch this flight
Odds over time
Arrive at SFB more than 15 minutes late?
41%
chance · ±5 pts
+2 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
41%
Leave 15+ late
38%
Arrive 1h+ late
17%
Cancelled
2%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
6.9d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at SFB more than 15 minutes late?
Calm-weather odds: 28% · changed +2 pts in 24h
+2 pts
41%
Yes 41%
No 59%
Leave PIT more than 15 minutes late?
Calm-weather odds: 37% · changed +0 pts in 24h
+0 pts
38%
Yes 38%
No 62%
Arrive at SFB more than an hour late?
Calm-weather odds: 11% · changed +0 pts in 24h
+0 pts
17%
Yes 17%
No 83%
Cancelled?
Calm-weather odds: 1% · changed +0 pts in 24h
+0 pts
2%
Yes 2%
No 98%
How late will it get to SFB?
On time or early
58%
15–30 min late
13%
30 min–1 hour late
10%
1–2 hours late
9%
Over 2 hours late
8%
Cancelled
2%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
Cloud base down to 600 ft, 0.5 in of rain forecast at SFB that day
↑
This flight has been late 35% of the time recently
↑
G4's recent on-time record
↓
PIT usually runs smoothly
↓
Mondays in October are usually quieter than average
Weather at each end
PIT (origin)
Gusts 17 kt Ceiling none (clear) Visibility 10+ mi Precip none
SFB (destination)
Gusts 10 kt Ceiling 600 ft Visibility 8 mi Precip 0.44 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.