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 3934
SCHEDULED · TYPICAL SCHEDULE
Thursday, October 1 Today
F9 3934 · BOI → DEN
departs 1:24 PM MT · arrives 3:30 PM MT
Forecast issued Thu 2:00 AM ET · 13h before departure
Watch this flight
Other days
Today
Sun 10/4 25%
Tue 10/6 20%
Odds over time
Arrive at DEN more than 15 minutes late?
21%
chance · ±0 pts
−9 pts · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
Arrive 15+ late
21%
Leave 15+ late
21%
Arrive 1h+ late
10%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
2.8d
2d
1d
Now
6h
Departs
Lands
Arrive at DEN more than 15 minutes late?
Calm-weather odds: 22% · changed −9 pts in 24h
−9 pts
21%
Yes 21%
No 79%
Leave BOI more than 15 minutes late?
Calm-weather odds: 26% · changed −1 pt in 24h
−1 pt
21%
Yes 21%
No 79%
Arrive at DEN more than an hour late?
Calm-weather odds: 6% · changed +1 pt in 24h
+1 pt
10%
Yes 10%
No 90%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to DEN?
On time or early
78%
15–30 min late
5%
30 min–1 hour late
7%
1–2 hours late
6%
Over 2 hours late
4%
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
↑
Arrivals into DEN at that hour are often late
↑
DEN is busy at that time
↓
Mostly benign weather forecast at BOI
↓
DEN usually runs smoothly
Weather at each end
BOI (origin)
Gusts 10 kt Ceiling none (clear) Visibility 10+ mi Precip none
DEN (destination)
Gusts 23 kt Ceiling none (clear) Visibility 10+ mi Precip 0.04 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.