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 1359 LANDED 12:45 PM CT, ~3 MIN LATE · SCHEDULED TIME UNKNOWN

WN 1359 · DTW → MDW

took off 1:04 PM ET · landed 12:45 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?
22% chance · ±0 pts – · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
LIVE IN THE AIR 0% 10% 20% 30% 40% 9h 6h Departs Lands