Schedule: a typical Sunday (the flights of Jul 26, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
FRONTIER · FLIGHT F9 3131
SCHEDULED · TYPICAL SCHEDULE
F9 3131 · IAH → ONT
departs 6:10 AM CT · arrives 7:32 AM PT
Forecast issued Thu 8:00 PM ET · 59h before departure
Odds over time
Arrive at ONT more than 15 minutes late?
28%
chance · ±1 pts
– · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
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How late will it get to ONT?
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On time or early
71%
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15–30 min late
16%
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30 min–1 hour late
6%
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1–2 hours late
3%
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Over 2 hours late
3%
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Cancelled
1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.