Schedule: a typical summer Monday (the flights of Jul 27, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
FRONTIER · FLIGHT F9 3440
SCHEDULED · TYPICAL SCHEDULE
Monday, October 5 Tomorrow
F9 3440 · SFO → DEN
departs 9:39 PM PT · arrives 1:29 AM MT
Forecast issued Sun 4:00 PM ET · 33h before departure
Watch this flight
Other days
Today 45%
Mon 10/5
Fri 10/9 38%
Odds over time
Arrive at DEN more than 15 minutes late?
35%
chance · ±3 pts
+2 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
35%
Leave 15+ late
38%
Arrive 1h+ late
10%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
7.0d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at DEN more than 15 minutes late?
Calm-weather odds: 30% · changed +2 pts in 24h
+2 pts
35%
Yes 35%
No 65%
Leave SFO more than 15 minutes late?
Calm-weather odds: 32% · changed +6 pts in 24h
+6 pts
38%
Yes 38%
No 62%
Arrive at DEN more than an hour late?
Calm-weather odds: 8% · changed +0 pts in 24h
+0 pts
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
64%
15–30 min late
<1%
30 min–1 hour late
24%
1–2 hours late
5%
Over 2 hours late
5%
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
↑
This flight has been late 35% of the time recently
↑
9pm departures from SFO are often late
↓
Mostly benign weather forecast at SFO
↓
Mostly benign weather forecast at DEN
Weather at each end
SFO (origin)
Gusts 13 kt Ceiling none (clear) Visibility 7 mi Precip none
DEN (destination)
Gusts 19 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.