Schedule: a typical Saturday (the flights of Jul 25, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
FRONTIER · FLIGHT F9 3131
SCHEDULED · TYPICAL SCHEDULE
Saturday, October 3
F9 3131 · IAH → ONT
departs 6:10 AM CT · arrives 7:32 AM PT
Forecast issued Thu 8:00 PM ET · 35h before departure
Watch this flight
Other days
Today 48%
Fri 10/2 26%
Sat 10/3
Sun 10/4 21%
Mon 10/5 22%
Tue 10/6 16%
Wed 10/7 15%
Odds over time
Arrive at ONT more than 15 minutes late?
23%
chance · ±1 pts
+1 pt · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
23%
Leave 15+ late
16%
Arrive 1h+ late
4%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
4.4d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at ONT more than 15 minutes late?
Calm-weather odds: 15% · changed +1 pt in 24h
+1 pt
23%
Yes 23%
No 77%
Leave IAH more than 15 minutes late?
Calm-weather odds: 14% · changed +0 pts in 24h
+0 pts
16%
Yes 16%
No 84%
Arrive at ONT more than an hour late?
Calm-weather odds: 3% · changed +0 pts in 24h
+0 pts
4%
Yes 4%
No 96%
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
76%
15–30 min late
12%
30 min–1 hour late
7%
1–2 hours late
2%
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
↑
IAH is prone to delays
↑
ONT is prone to delays
↓
Early flights usually leave on time
↓
6am departures from IAH are usually not late
Weather at each end
IAH (origin)
Gusts 14 kt Ceiling 3,300 ft Visibility 10+ mi Precip 0.60 in
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.