Schedule: a typical Saturday (the flights of Jul 25, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
FRONTIER · FLIGHT F9 1159
SCHEDULED · TYPICAL SCHEDULE
Saturday, October 3
F9 1159 · ONT → SFO
departs 8:58 AM PT · arrives 10:30 AM PT
Forecast issued Thu 5:00 AM ET · 55h before departure
Watch this flight
Other days
Today 38%
Fri 10/2 37%
Sat 10/3
Sun 10/4 27%
Mon 10/5 30%
Tue 10/6 23%
Wed 10/7 28%
Odds over time
Arrive at SFO more than 15 minutes late?
19%
chance · ±1 pts
– · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
19%
Leave 15+ late
15%
Arrive 1h+ late
9%
Cancelled
2%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
4.6d
Now
2d
1d
12h
6h
Departs
Lands
Arrive at SFO more than 15 minutes late?
Calm-weather odds: 22% · changed – in 24h
–
19%
Yes 19%
No 81%
Leave ONT more than 15 minutes late?
Calm-weather odds: 15% · changed – in 24h
–
15%
Yes 15%
No 85%
Arrive at SFO more than an hour late?
Calm-weather odds: 9% · changed – in 24h
–
9%
Yes 9%
No 91%
Cancelled?
Calm-weather odds: 1% · changed – in 24h
–
2%
Yes 2%
No 98%
How late will it get to SFO?
On time or early
80%
15–30 min late
5%
30 min–1 hour late
5%
1–2 hours late
4%
Over 2 hours late
5%
Cancelled
2%
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
↓
Visibility down to 2 mi forecast at SFO that day
↓
Saturdays in October are usually quieter than average
Weather at each end
ONT (origin)
Gusts 14 kt Ceiling none (clear) Visibility 10+ mi Precip none
SFO (destination)
Gusts 11 kt Ceiling none (clear) Visibility 2 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.