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.
FRONTIER · FLIGHT F9 3981
SCHEDULED · TYPICAL SCHEDULE
Sunday, October 4
F9 3981 · DEN → SLC
departs 6:00 AM MT · arrives 7:31 AM MT
Forecast issued Fri 7:00 PM ET · 37h before departure
Watch this flight
Other days
Today 22%
Sat 10/3 22%
Sun 10/4
Mon 10/5 18%
Odds over time
Arrive at SLC more than 15 minutes late?
10%
chance · ±2 pts
+0 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
10%
Leave 15+ late
13%
Arrive 1h+ late
4%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
5%
10%
15%
20%
5.4d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at SLC more than 15 minutes late?
Calm-weather odds: 11% · changed +0 pts in 24h
+0 pts
10%
Yes 10%
No 90%
Leave DEN more than 15 minutes late?
Calm-weather odds: 12% · changed +0 pts in 24h
+0 pts
13%
Yes 13%
No 87%
Arrive at SLC more than an hour late?
Calm-weather odds: 4% · changed +0 pts in 24h
+0 pts
4%
Yes 4%
No 96%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to SLC?
On time or early
90%
15–30 min late
4%
30 min–1 hour late
2%
1–2 hours late
3%
Over 2 hours late
1%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
F9's recent on-time record
↑
DEN is busy at that time
↑
Other factors
↓
Early flights usually leave on time
↓
Gusts to 26 kt forecast at DEN that day
Weather at each end
DEN (origin)
Gusts 26 kt Ceiling none (clear) Visibility 10+ mi Precip none
SLC (destination)
Gusts 11 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.