Schedule: a typical summer Thursday (the flights of Jul 30, 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
Thursday, October 1
F9 3981 · DEN → SLC
departs 6:00 AM MT · arrives 7:31 AM MT
Forecast issued Thu 10:00 PM ET · 14h after departure
Watch this flight
Other days
Thu 10/1
Today 10%
Mon 10/5 24%
Fri 10/9 23%
Odds over time
Arrive at SLC more than 15 minutes late?
10%
chance · ±0 pts
−9 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
10%
Leave 15+ late
11%
Arrive 1h+ late
3%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
2.9d
2d
1d
12h
6h
Departs
Lands
Arrive at SLC more than 15 minutes late?
Calm-weather odds: 10% · changed −9 pts in 24h
−9 pts
10%
Yes 10%
No 90%
Leave DEN more than 15 minutes late?
Calm-weather odds: 11% · changed −5 pts in 24h
−5 pts
11%
Yes 11%
No 89%
Arrive at SLC more than an hour late?
Calm-weather odds: 3% · changed −4 pts in 24h
−4 pts
3%
Yes 3%
No 97%
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
3%
30 min–1 hour late
4%
1–2 hours late
2%
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
↓
Mostly benign weather forecast at DEN
Weather at each end
DEN (origin)
Gusts 21 kt Ceiling 7,000 ft Visibility 10+ mi Precip none
SLC (destination)
Gusts 8 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.