Schedule: a typical summer Monday (the flights of Jul 27, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.

UNITED · FLIGHT UA 1563 SCHEDULED · TYPICAL SCHEDULE

Monday, October 5

UA 1563 · IAH → ONT

departs 8:31 PM CT · arrives 9:55 PM PT

Forecast issued Sat 2:00 PM ET · 56h before departure

Arrive at ONT more than 15 minutes late?

18% chance · ±3 pts – · 24h

HOW SURE WE ARE Moderate. The odds now blend history with early weather forecasts.

How late will it get to ONT?

On time or early
82%
15–30 min late
8%
30 min–1 hour late
4%
1–2 hours late
4%
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

↑ Later flights pick up delays from earlier in the day

↑ 8pm departures from IAH are often late

↑ Arrivals into ONT at that hour are often late

↓ Mondays in October are usually quieter than average

↓ UA's recent on-time record

Weather at each end

IAH (origin) Gusts17 kt Ceiling11,000 ft Visibility10+ mi Precipnone

ONT (destination) Gusts15 kt Ceilingnone (clear) Visibility10+ mi Precipnone

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.

UA 1563 · IAH → ONT

Odds over time

How late will it get to ONT?