Schedule: a typical summer Sunday (the flights of Jul 26, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
FRONTIER · FLIGHT F9 4689
SCHEDULED · TYPICAL SCHEDULE
Sunday, October 4
F9 4689 · DFW → ONT
departs 7:31 AM CT · arrives 8:37 AM PT
Forecast issued Fri 12:00 AM ET · 56h before departure
Watch this flight
Other days
Today 35%
Sat 10/3 31%
Sun 10/4
Mon 10/5 22%
Tue 10/6 16%
Wed 10/7 16%
Thu 10/8 22%
Odds over time
Arrive at ONT more than 15 minutes late?
26%
chance · ±1 pts
– · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
26%
Leave 15+ late
25%
Arrive 1h+ late
9%
Cancelled
1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
5.4d
Now
2d
1d
12h
6h
Departs
Lands
Arrive at ONT more than 15 minutes late?
Calm-weather odds: 20% · changed – in 24h
–
26%
Yes 26%
No 74%
Leave DFW more than 15 minutes late?
Calm-weather odds: 19% · changed – in 24h
–
25%
Yes 25%
No 75%
Arrive at ONT more than an hour late?
Calm-weather odds: 5% · changed – in 24h
–
9%
Yes 9%
No 91%
Cancelled?
Calm-weather odds: <1% · changed – in 24h
–
1%
Yes 1%
No 99%
How late will it get to ONT?
On time or early
73%
15–30 min late
10%
30 min–1 hour late
7%
1–2 hours late
7%
Over 2 hours late
2%
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
↑
Cloud base down to 700 ft forecast at DFW that day
↑
ONT is prone to delays
↓
Early flights usually leave on time
↓
Mostly benign weather forecast at ONT
Weather at each end
DFW (origin)
Gusts 19 kt Ceiling 700 ft Visibility 6 mi Precip 0.08 in
ONT (destination)
Gusts 17 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.