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 1261
SCHEDULED · TYPICAL SCHEDULE
Friday, October 2 Tomorrow
F9 1261 · DEN → ONT
departs 10:29 PM MT · arrives 11:50 PM PT
Forecast issued Thu 11:00 PM ET · 26h before departure
Watch this flight
Other days
Today
Sat 10/3 25%
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?
31%
chance · ±8 pts
−2 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
31%
Leave 15+ late
38%
Arrive 1h+ late
9%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
4.1d
2d
Now
12h
6h
Departs
Lands
Arrive at ONT more than 15 minutes late?
Calm-weather odds: 25% · changed −2 pts in 24h
−2 pts
31%
Yes 31%
No 69%
Leave DEN more than 15 minutes late?
Calm-weather odds: 31% · changed +0 pts in 24h
+0 pts
38%
Yes 38%
No 62%
Arrive at ONT more than an hour late?
Calm-weather odds: 7% · changed −1 pt in 24h
−1 pt
9%
Yes 9%
No 91%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to ONT?
On time or early
68%
15–30 min late
16%
30 min–1 hour late
7%
1–2 hours late
5%
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
↑
Later flights pick up delays from earlier in the day
↑
10pm departures from DEN are often late
↓
Mostly benign weather forecast at ONT
↓
DEN usually runs smoothly
Weather at each end
DEN (origin)
Gusts 28 kt Ceiling none (clear) Visibility 10+ mi Precip none
ONT (destination)
Gusts 15 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.