Schedule: a typical summer Sunday (the flights of Jul 26, 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
Sunday, October 4 Today
F9 3440 · SFO → DEN
departs 9:39 PM PT · arrives 1:29 AM MT
Forecast issued Sun 5:00 PM ET · 8h before departure
Watch this flight
Other days
Today
Mon 10/5 37%
Fri 10/9 38%
Odds over time
Arrive at DEN more than 15 minutes late?
42%
chance · ±0 pts
+5 pts · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
Arrive 15+ late
42%
Leave 15+ late
51%
Arrive 1h+ late
19%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
6.1d
2d
1d
12h
Now
Departs
Lands
Arrive at DEN more than 15 minutes late?
Calm-weather odds: 33% · changed +5 pts in 24h
+5 pts
42%
Yes 42%
No 58%
Leave SFO more than 15 minutes late?
Calm-weather odds: 35% · changed +9 pts in 24h
+9 pts
51%
Yes 51%
No 49%
Arrive at DEN more than an hour late?
Calm-weather odds: 9% · changed +7 pts in 24h
+7 pts
19%
Yes 19%
No 81%
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
57%
15–30 min late
8%
30 min–1 hour late
16%
1–2 hours late
14%
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
↑
This flight has been late 35% of the time recently
↑
9pm departures from SFO are often late
↓
Mostly benign weather forecast at SFO
↓
DEN usually runs smoothly
Weather at each end
SFO (origin)
Gusts 5 kt Ceiling none (clear) Visibility 10+ mi Precip none
DEN (destination)
Gusts 24 kt Ceiling 7,500 ft 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.