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 1231 LANDED 7:00 PM PT, ~8 MIN LATE · SCHEDULED TIME UNKNOWN

Tuesday, September 29 Yesterday

WN 1231 · SFO → LAS

took off 5:53 PM PT · landed 7:00 PM PT (scheduled time unknown)

Forecast issued Tue 10:00 PM ET · 1h after departure

Arrive at LAS more than 15 minutes late?

69% chance · ±1 pts +11 pts · 24h

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

What’s moving the odds

↑ Arrivals into LAS at that hour are often late

↑ LAS is prone to delays

↑ Other factors

↓ Tuesdays in September are usually quieter than average

↓ Mostly benign weather forecast at SFO

Weather at each end

SFO (origin) Gusts19 kt Ceilingnone (clear) Visibility10+ mi Precipnone

LAS (destination) Gusts27 kt Ceiling4,700 ft Visibility7 mi Precip0.08 in

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 1231 · SFO → LAS

Odds over time