Schedule: the flights that flew on Thursday, Oct 22, re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
FRONTIER · FLIGHT F9 3999
SCHEDULED · TYPICAL SCHEDULE
Thursday, October 29 Tomorrow
F9 3999 · DFW → SFO
departs 8:22 PM CT · arrives 10:11 PM PT
Forecast issued Wed 6:00 AM ET · 39h before departure
Watch this flight
Other days
Today 37%
Thu 10/29
Fri 10/30 47%
Sat 10/31 40%
Sun 11/1 64%
Mon 11/2 49%
Odds over time
Arrive at SFO more than 15 minutes late?
39%
chance · ±10 pts
−6 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
39%
Leave 15+ late
47%
Arrive 1h+ late
16%
Cancelled
1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
20%
40%
60%
80%
6.9d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at SFO more than 15 minutes late?
Calm-weather odds: 35% · changed −6 pts in 24h
−6 pts
39%
Yes 39%
No 61%
Leave DFW more than 15 minutes late?
Calm-weather odds: 38% · changed +4 pts in 24h
+4 pts
47%
Yes 47%
No 53%
Arrive at SFO more than an hour late?
Calm-weather odds: 14% · changed +0 pts in 24h
+0 pts
16%
Yes 16%
No 84%
Cancelled?
Calm-weather odds: 1% · changed +0 pts in 24h
+0 pts
1%
Yes 1%
No 99%
How late will it get to SFO?
On time or early
60%
15–30 min late
6%
30 min–1 hour late
17%
1–2 hours late
10%
Over 2 hours late
6%
Cancelled
1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
This flight has been late 42% of the time recently
↑
F9's recent on-time record
↑
8pm departures from DFW are often late
↓
Mostly benign weather forecast at SFO
↓
Mostly benign weather forecast at DFW
Weather at each end
DFW (origin)
Gusts 14 kt Ceiling 1,300 ft Visibility 8.66667 mi Precip none
SFO (destination)
Gusts 9 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.