Schedule: a typical Tuesday (the flights of Jul 28, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
FRONTIER · FLIGHT F9 3871
SCHEDULED · TYPICAL SCHEDULE
Tuesday, September 29 Yesterday
F9 3871 · SLC → PHX
departs 12:41 PM MT · arrives 1:21 PM MT
Forecast issued Tue 10:00 PM ET · 7h after departure
Watch this flight
Other days
Tue 9/29
Today 20%
Thu 10/1 16%
Fri 10/2 20%
Sat 10/3 18%
Sun 10/4 22%
Mon 10/5 20%
Tue 10/6 16%
Odds over time
Arrive at PHX more than 15 minutes late?
23%
chance · ±0 pts
−5 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
23%
Leave 15+ late
20%
Arrive 1h+ late
9%
Cancelled
1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
2.9d
2d
1d
12h
6h
Departs
Lands
Arrive at PHX more than 15 minutes late?
Calm-weather odds: 23% · changed −5 pts in 24h
−5 pts
23%
Yes 23%
No 77%
Leave SLC more than 15 minutes late?
Calm-weather odds: 20% · changed −5 pts in 24h
−5 pts
20%
Yes 20%
No 80%
Arrive at PHX more than an hour late?
Calm-weather odds: 9% · changed +0 pts in 24h
+0 pts
9%
Yes 9%
No 91%
Cancelled?
Calm-weather odds: 1% · changed +0 pts in 24h
+0 pts
1%
Yes 1%
No 99%
How late will it get to PHX?
On time or early
76%
15–30 min late
4%
30 min–1 hour late
10%
1–2 hours late
6%
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
↑
PHX is prone to delays
↑
Cloud base down to 1,300 ft, visibility down to 0.5 mi, 0.3 in of rain, thunderstorms forecast at PHX that day
↓
Tuesdays in September are usually quieter than average
↓
SLC usually runs smoothly
Weather at each end
SLC (origin)
Gusts 15 kt Ceiling 6,500 ft Visibility 10+ mi Precip none
PHX (destination)
Gusts 21 kt Ceiling 1,300 ft Visibility 0.5 mi Precip 0.34 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.