Schedule: a typical Thursday (the flights of Jul 30, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
FRONTIER · FLIGHT F9 4251
SCHEDULED · TYPICAL SCHEDULE
Thursday, October 1 Today
F9 4251 · DEN → SLC
departs 10:13 PM MT · arrives 11:44 PM MT
Forecast issued Thu 1:00 PM ET · 11h before departure
Watch this flight
Other days
Today
Fri 10/2 36%
Sat 10/3 26%
Sun 10/4 28%
Mon 10/5 24%
Tue 10/6 16%
Wed 10/7 15%
Odds over time
Arrive at SLC more than 15 minutes late?
33%
chance · ±0 pts
+0 pts · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
Arrive 15+ late
33%
Leave 15+ late
41%
Arrive 1h+ late
15%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
2.9d
2d
1d
Now
6h
Departs
Lands
Arrive at SLC more than 15 minutes late?
Calm-weather odds: 30% · changed +0 pts in 24h
+0 pts
33%
Yes 33%
No 67%
Leave DEN more than 15 minutes late?
Calm-weather odds: 38% · changed +3 pts in 24h
+3 pts
41%
Yes 41%
No 59%
Arrive at SLC more than an hour late?
Calm-weather odds: 8% · changed +6 pts in 24h
+6 pts
15%
Yes 15%
No 85%
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
66%
15–30 min late
14%
30 min–1 hour late
4%
1–2 hours late
13%
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
↑
Later flights pick up delays from earlier in the day
↑
DEN is busy at that time
↓
Mostly benign weather forecast at SLC
↓
Mostly benign weather forecast at DEN
Weather at each end
DEN (origin)
Gusts 22 kt Ceiling 7,000 ft 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.