Schedule: a typical summer Thursday (the flights of Jul 30, 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
Thursday, October 1 Today
F9 1261 · DEN → ONT
departs 10:29 PM MT · arrives 11:50 PM PT
Forecast issued Thu 10:00 PM ET · 2h before departure
Watch this flight
Other days
Today
Fri 10/2 33%
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?
44%
chance · ±0 pts
+5 pts · 24h
HOW SURE WE ARE
High. The odds now come mostly from live FAA and airport data.
Arrive 15+ late
44%
Leave 15+ late
51%
Arrive 1h+ late
23%
Cancelled
1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
2.8d
2d
1d
12h
6h
Now
Departs
Lands
Arrive at ONT more than 15 minutes late?
Calm-weather odds: 26% · changed +5 pts in 24h
+5 pts
44%
Yes 44%
No 56%
Leave DEN more than 15 minutes late?
Calm-weather odds: 38% · changed −3 pts in 24h
−3 pts
51%
Yes 51%
No 49%
Arrive at ONT more than an hour late?
Calm-weather odds: 9% · changed +10 pts in 24h
+10 pts
23%
Yes 23%
No 77%
Cancelled?
Calm-weather odds: <1% · changed +1 pt in 24h
+1 pt
1%
Yes 1%
No 99%
How late will it get to ONT?
On time or early
56%
15–30 min late
27%
30 min–1 hour late
0%
1–2 hours late
14%
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
↑
DEN is busy at that time
↓
Mostly benign weather forecast at DEN
↓
Mostly benign weather forecast at ONT
Weather at each end
DEN (origin)
Gusts 21 kt Ceiling 7,000 ft Visibility 10+ mi Precip none
ONT (destination)
Gusts 18 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.