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 4345
SCHEDULED · TYPICAL SCHEDULE
Tuesday, September 29 Yesterday
F9 4345 · DEN → LAX
departs 10:39 PM MT · arrives 12:11 AM PT
Forecast issued Tue 10:00 PM ET · 3h before departure
Watch this flight
Other days
Tue 9/29
Today 26%
Thu 10/1 30%
Fri 10/2 27%
Sat 10/3 26%
Sun 10/4 30%
Mon 10/5 26%
Tue 10/6 16%
Odds over time
Arrive at LAX more than 15 minutes late?
23%
chance · ±2 pts
+3 pts · 24h
HOW SURE WE ARE
High. The odds now come mostly from live FAA and airport data.
Arrive 15+ late
23%
Leave 15+ late
28%
Arrive 1h+ late
8%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
2.8d
2d
1d
12h
6h
Now
Departs
Lands
Arrive at LAX more than 15 minutes late?
Calm-weather odds: 18% · changed +3 pts in 24h
+3 pts
23%
Yes 23%
No 77%
Leave DEN more than 15 minutes late?
Calm-weather odds: 22% · changed +0 pts in 24h
+0 pts
28%
Yes 28%
No 72%
Arrive at LAX more than an hour late?
Calm-weather odds: 5% · changed +2 pts in 24h
+2 pts
8%
Yes 8%
No 92%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to LAX?
On time or early
76%
15–30 min late
7%
30 min–1 hour late
8%
1–2 hours late
5%
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
↑
10pm departures from DEN are often late
↓
Tuesdays in September are usually quieter than average
↓
DEN usually runs smoothly
Weather at each end
DEN (origin)
Gusts 9 kt Ceiling 6,000 ft Visibility 10+ mi Precip none
LAX (destination)
Gusts 24 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.