Schedule: a typical summer Wednesday (the flights of Jul 29, 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
Wednesday, September 30
F9 3981 · DEN → SLC
departs 1:18 PM MT · arrives 2:55 PM MT
Forecast issued Wed 10:00 PM ET · 7h after departure
Watch this flight
Other days
Wed 9/30
Today 10%
Mon 10/5 25%
Fri 10/9 23%
Odds over time
Arrive at SLC more than 15 minutes late?
19%
chance · ±0 pts
−14 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
19%
Leave 15+ late
26%
Arrive 1h+ late
5%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
20%
40%
60%
80%
2.9d
2d
1d
12h
6h
Departs
Lands
Arrive at SLC more than 15 minutes late?
Calm-weather odds: 19% · changed −14 pts in 24h
−14 pts
19%
Yes 19%
No 81%
Leave DEN more than 15 minutes late?
Calm-weather odds: 26% · changed −16 pts in 24h
−16 pts
26%
Yes 26%
No 74%
Arrive at SLC more than an hour late?
Calm-weather odds: 5% · changed −5 pts in 24h
−5 pts
5%
Yes 5%
No 95%
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
81%
15–30 min late
4%
30 min–1 hour late
9%
1–2 hours late
3%
Over 2 hours late
2%
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
↑
1pm departures from DEN are often late
↑
DEN is busy at that time
↓
Wednesdays in September are usually quieter than average
↓
Mostly benign weather forecast at DEN
Weather at each end
DEN (origin)
Gusts 20 kt Ceiling 8,000 ft Visibility 10+ mi Precip 0.03 in
SLC (destination)
Gusts 17 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.