Schedule: a typical summer Friday (the flights of Jul 31, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
FRONTIER · FLIGHT F9 1159
SCHEDULED · TYPICAL SCHEDULE
Friday, October 2 Today
F9 1159 · ONT → SFO
departs 8:58 AM PT · arrives 10:30 AM PT
Forecast issued Fri 2:00 AM ET · 10h before departure
Watch this flight
Other days
Today
Sat 10/3 29%
Sun 10/4 22%
Mon 10/5 30%
Tue 10/6 23%
Wed 10/7 28%
Thu 10/8 28%
Odds over time
Arrive at SFO more than 15 minutes late?
52%
chance · ±0 pts
+15 pts · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
Arrive 15+ late
52%
Leave 15+ late
52%
Arrive 1h+ late
29%
Cancelled
17%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
20%
40%
60%
80%
3.6d
2d
1d
Now
6h
Departs
Lands
Arrive at SFO more than 15 minutes late?
Calm-weather odds: 23% · changed +15 pts in 24h
+15 pts
52%
Yes 52%
No 48%
Leave ONT more than 15 minutes late?
Calm-weather odds: 18% · changed +23 pts in 24h
+23 pts
52%
Yes 52%
No 48%
Arrive at SFO more than an hour late?
Calm-weather odds: 9% · changed +12 pts in 24h
+12 pts
29%
Yes 29%
No 71%
Cancelled?
Calm-weather odds: 1% · changed +16 pts in 24h
+16 pts
17%
Yes 17%
No 83%
How late will it get to SFO?
On time or early
40%
15–30 min late
19%
30 min–1 hour late
<1%
1–2 hours late
18%
Over 2 hours late
6%
Cancelled
17%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
This flight has been late 47% of the time recently
↑
F9's recent on-time record
↑
Arrivals into SFO at that hour are often late
↓
Mostly benign weather forecast at ONT
↓
Fridays in October are usually quieter than average
Weather at each end
ONT (origin)
Gusts 15 kt Ceiling none (clear) Visibility 10+ mi Precip none
SFO (destination)
Gusts 8 kt Ceiling 100 ft Visibility 0.5 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.