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 2412 LANDED 8:36 AM CT, ~6 MIN LATE · SCHEDULED TIME UNKNOWN

WN 2412 · LGA → MDW

took off 7:55 AM ET · landed 8:36 AM CT (scheduled time unknown)
Forecast issued Wed 10:00 PM ET · 14h after departure

Odds over time

Arrive at MDW more than 15 minutes late?
30% chance · ±0 pts +8 pts · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
WEATHER FORECASTS LIVE IN THE AIR 0% 10% 20% 30% 40% 1.0d 12h 6h Departs Lands