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 573 LANDED 1:26 PM CT, ~5 MIN LATE · SCHEDULED TIME UNKNOWN

WN 573 · BNA → MDW

took off 12:21 PM CT · landed 1:26 PM CT (scheduled time unknown)
Forecast issued Tue 10:00 PM ET · 9h after departure

Odds over time

Arrive at MDW more than 15 minutes late?
19% chance · ±0 pts +16 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% 3.2d 2d 1d 12h 6h Departs Lands