Schedule: a typical summer Saturday (the flights of Jul 25, 2026), 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
Saturday, October 3
F9 3999 · DFW → SFO
departs 8:59 PM CT · arrives 10:59 PM PT
Forecast issued Thu 11:00 PM ET · 47h before departure
Watch this flight
Other days
Today 48%
Sat 10/3
Sun 10/4 45%
Mon 10/5 36%
Tue 10/6 25%
Wed 10/7 31%
Odds over time
Arrive at SFO more than 15 minutes late?
42%
chance · ±5 pts
+3 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
42%
Leave 15+ late
52%
Arrive 1h+ late
21%
Cancelled
4%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
5.0d
Now
1d
12h
6h
Departs
Lands
Arrive at SFO more than 15 minutes late?
Calm-weather odds: 30% · changed +3 pts in 24h
+3 pts
42%
Yes 42%
No 58%
Leave DFW more than 15 minutes late?
Calm-weather odds: 31% · changed +4 pts in 24h
+4 pts
52%
Yes 52%
No 48%
Arrive at SFO more than an hour late?
Calm-weather odds: 10% · changed +5 pts in 24h
+5 pts
21%
Yes 21%
No 79%
Cancelled?
Calm-weather odds: 1% · changed +2 pts in 24h
+2 pts
4%
Yes 4%
No 96%
How late will it get to SFO?
On time or early
55%
15–30 min late
8%
30 min–1 hour late
12%
1–2 hours late
13%
Over 2 hours late
7%
Cancelled
4%
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
↑
8pm departures from DFW are often late
↑
Cloud base down to 400 ft, visibility down to 2 mi, 0.5 in of rain forecast at DFW that day
↓
Visibility down to 0.7 mi forecast at SFO that day
↓
Saturdays in October are usually quieter than average
Weather at each end
DFW (origin)
Gusts 15 kt Ceiling 400 ft Visibility 2 mi Precip 0.52 in
SFO (destination)
Gusts 12 kt Ceiling none (clear) Visibility 0.7 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.