Tracked live by the FAA, but its flight plan was first seen after takeoff, so we don't know the scheduled time and can't say whether it's late.

SOUTHWEST · FLIGHT WN 4923 SCHEDULED · SCHEDULED TIME UNKNOWN

Tuesday, September 29 Today

WN 4923 · LAS → ONT

departs 3:17 PM PT · arrives 3:50 PM PT

Forecast issued Tue 3:00 PM ET · 3h before departure

Arrive at ONT more than 15 minutes late?

78% chance · ±3 pts +25 pts · 24h

HOW SURE WE ARE High. The odds now come mostly from live FAA and airport data.

What’s moving the odds

↑ Mostly benign weather forecast at LAS

↑ LAS is prone to delays

↑ 3pm departures from LAS are often late

↓ Tuesdays in September are usually quieter than average

↓ Mostly benign weather forecast at ONT

Weather at each end

LAS (origin) Gusts23 kt Ceiling4,700 ft Visibility7 mi Precip0.19 in

ONT (destination) Gusts20 kt Ceilingnone (clear) Visibility9 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.

WN 4923 · LAS → ONT

Odds over time