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 1261
SCHEDULED · TYPICAL SCHEDULE
Saturday, October 3
F9 1261 · DEN → ONT
departs 10:29 PM MT · arrives 11:50 PM PT
Forecast issued Thu 10:00 PM ET · 50h before departure
Watch this flight
Other days
Today 44%
Fri 10/2 33%
Sat 10/3
Sun 10/4 29%
Mon 10/5 26%
Tue 10/6 16%
Wed 10/7 17%
Odds over time
Arrive at ONT more than 15 minutes late?
25%
chance · ±7 pts
– · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
25%
Leave 15+ late
33%
Arrive 1h+ late
8%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
5.1d
Now
1d
12h
6h
Departs
Lands
Arrive at ONT more than 15 minutes late?
Calm-weather odds: 22% · changed – in 24h
–
25%
Yes 25%
No 75%
Leave DEN more than 15 minutes late?
Calm-weather odds: 28% · changed – in 24h
–
33%
Yes 33%
No 67%
Arrive at ONT more than an hour late?
Calm-weather odds: 6% · changed – in 24h
–
8%
Yes 8%
No 92%
Cancelled?
Calm-weather odds: <1% · changed – in 24h
–
<1%
Yes <1%
No 99%
How late will it get to ONT?
On time or early
74%
15–30 min late
13%
30 min–1 hour late
4%
1–2 hours late
5%
Over 2 hours late
3%
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
↑
Later flights pick up delays from earlier in the day
↑
10pm departures from DEN are often late
↓
Mostly benign weather forecast at DEN
↓
Mostly benign weather forecast at ONT
Weather at each end
DEN (origin)
Gusts 20 kt Ceiling none (clear) Visibility 10+ mi Precip none
ONT (destination)
Gusts 14 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.