Schedule: a typical summer Tuesday (the flights of Jul 28, 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
Tuesday, September 29
F9 1159 · ONT → SFO
departs 8:58 AM PT · arrives 10:30 AM PT
Forecast issued Tue 10:00 PM ET · 10h after departure
Watch this flight
Other days
Tue 9/29
Today 25%
Mon 10/5 25%
Thu 10/8 28%
Fri 10/9 40%
Odds over time
Arrive at SFO more than 15 minutes late?
24%
chance · ±0 pts
+2 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
24%
Leave 15+ late
15%
Arrive 1h+ late
6%
Cancelled
1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
2.9d
2d
1d
12h
6h
Departs
Lands
Arrive at SFO more than 15 minutes late?
Calm-weather odds: 24% · changed +2 pts in 24h
+2 pts
24%
Yes 24%
No 76%
Leave ONT more than 15 minutes late?
Calm-weather odds: 15% · changed +0 pts in 24h
+0 pts
15%
Yes 15%
No 85%
Arrive at SFO more than an hour late?
Calm-weather odds: 6% · changed +1 pt in 24h
+1 pt
6%
Yes 6%
No 94%
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
75%
15–30 min late
7%
30 min–1 hour late
9%
1–2 hours late
3%
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
↑
Arrivals into SFO at that hour are often late
↑
This flight has been late 21% of the time recently
↓
Mostly benign weather forecast at SFO
↓
Tuesdays in September are usually quieter than average
Weather at each end
ONT (origin)
Gusts 19 kt Ceiling none (clear) Visibility 9 mi Precip none
SFO (destination)
Gusts 19 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.