Schedule: a typical summer Monday (the flights of Jul 27, 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
Monday, October 5
F9 1159 · ONT → SFO
departs 8:58 AM PT · arrives 10:30 AM PT
Forecast issued Sat 12:00 PM ET · 48h before departure
Watch this flight
Other days
Today 25%
Sun 10/4 26%
Mon 10/5
Thu 10/8 28%
Fri 10/9 40%
Odds over time
Arrive at SFO more than 15 minutes late?
22%
chance · ±2 pts
+2 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
22%
Leave 15+ late
18%
Arrive 1h+ late
9%
Cancelled
2%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
6.5d
Now
1d
12h
6h
Departs
Lands
Arrive at SFO more than 15 minutes late?
Calm-weather odds: 23% · changed +2 pts in 24h
+2 pts
22%
Yes 22%
No 78%
Leave ONT more than 15 minutes late?
Calm-weather odds: 19% · changed +0 pts in 24h
+0 pts
18%
Yes 18%
No 82%
Arrive at SFO more than an hour late?
Calm-weather odds: 9% · changed +0 pts in 24h
+0 pts
9%
Yes 9%
No 91%
Cancelled?
Calm-weather odds: 1% · changed +0 pts in 24h
+0 pts
2%
Yes 2%
No 98%
How late will it get to SFO?
On time or early
77%
15–30 min late
6%
30 min–1 hour late
7%
1–2 hours late
3%
Over 2 hours late
7%
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
↓
Mondays 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 13 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.