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.
FRONTIER · FLIGHT F9 3981
SCHEDULED · TYPICAL SCHEDULE
Saturday, October 3 Today
F9 3981 · DEN → SLC
departs 1:18 PM MT · arrives 2:55 PM MT
Forecast issued Sat 2:00 AM ET · 13h before departure
Watch this flight
Other days
Today
Sun 10/4 11%
Mon 10/5 22%
Fri 10/9 23%
Odds over time
Arrive at SLC more than 15 minutes late?
30%
chance · ±0 pts
+6 pts · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
Arrive 15+ late
30%
Leave 15+ late
45%
Arrive 1h+ late
10%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
4.7d
2d
1d
Now
6h
Departs
Lands
Arrive at SLC more than 15 minutes late?
Calm-weather odds: 24% · changed +6 pts in 24h
+6 pts
30%
Yes 30%
No 70%
Leave DEN more than 15 minutes late?
Calm-weather odds: 24% · changed +19 pts in 24h
+19 pts
45%
Yes 45%
No 55%
Arrive at SLC more than an hour late?
Calm-weather odds: 7% · changed +2 pts in 24h
+2 pts
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 SLC?
On time or early
70%
15–30 min late
15%
30 min–1 hour late
5%
1–2 hours late
7%
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
↑
F9's recent on-time record
↑
DEN is busy at that time
↑
1pm departures from DEN are often late
↓
Gusts to 27 kt forecast at DEN that day
↓
Mostly benign weather forecast at SLC
Weather at each end
DEN (origin)
Gusts 27 kt Ceiling none (clear) Visibility 10+ mi Precip none
SLC (destination)
Gusts 10 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.