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 2358 LANDED 6:10 AM CT, ~8 MIN LATE · SCHEDULED TIME UNKNOWN
Yesterday

WN 2358 · LAX → MDW

took off 12:35 AM PT · landed 6:10 AM CT (scheduled time unknown)
Forecast issued Wed 10:00 PM ET · 18h after departure

Odds over time

Arrive at MDW more than 15 minutes late?
16% chance · ±0 pts +1 pt · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
WEATHER FORECASTS LIVE IN THE AIR 0% 15% 30% 45% 60% 1.1d 12h 6h Departs Lands