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 4570 LANDED 12:57 AM PT, ~1 MIN EARLY · SCHEDULED TIME UNKNOWN

Saturday, October 3 Yesterday

WN 4570 · LAS → ONT

took off 12:25 AM PT · landed 12:57 AM PT (scheduled time unknown)

Forecast issued Sat 10:00 PM ET · 19h after departure

Arrive at ONT more than 15 minutes late?

24% chance · ±0 pts +13 pts · 24h

HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.

What’s moving the odds

↑ Other factors

↑ 12am departures from LAS are often late

↑ LAS is prone to delays

↓ Early flights usually leave on time

↓ Mostly benign weather forecast at LAS

Weather at each end

LAS (origin) Gusts6 kt Ceilingnone (clear) 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.

WN 4570 · LAS → ONT

Odds over time