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 4978 LANDED 9:58 PM CT, ~1 MIN EARLY · SCHEDULED TIME UNKNOWN

Tuesday, September 29 Yesterday

WN 4978 · PHX → MDW

took off 5:11 PM MT · landed 9:58 PM CT (scheduled time unknown)

Forecast issued Tue 10:00 PM ET · 2h after departure

Arrive at MDW more than 15 minutes late?

48% chance · ±1 pts +4 pts · 24h

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

What’s moving the odds

↑ 5pm departures from PHX are often late

↑ Cloud base down to 1,300 ft, visibility down to 0.5 mi, 0.3 in of rain, thunderstorms forecast at PHX that day

↑ Later flights pick up delays from earlier in the day

↓ Tuesdays in September are usually quieter than average

↓ Mostly benign weather forecast at MDW

Weather at each end

PHX (origin) Gusts21 kt Ceiling1,300 ft Visibility0.5 mi Precip0.34 in

MDW (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 4978 · PHX → MDW

Odds over time