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 4678 SCHEDULED · SCHEDULED TIME UNKNOWN

Wednesday, September 30 Yesterday

WN 4678 · MDW → ATL

departs 8:18 PM CT · arrives 10:34 PM ET

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

Arrive at ATL more than 15 minutes late?

50% chance · ±1 pts +19 pts · 24h

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

What’s moving the odds

↑ Cloud base down to 700 ft, visibility down to 2.5 mi, 1.0 in of rain forecast at MDW that day

↑ 8pm departures from MDW are often late

↑ Other factors

↓ Wednesdays in September are usually quieter than average

↓ Cloud base down to 200 ft, visibility down to 0.5 mi forecast at ATL that day

Weather at each end

MDW (origin) Gusts21 kt Ceiling700 ft Visibility2.5 mi Precip0.94 in

ATL (destination) Gusts9 kt Ceiling200 ft Visibility0.5 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 4678 · MDW → ATL

Odds over time