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 3013 LANDED 7:10 AM CT, ~10 MIN LATE · SCHEDULED TIME UNKNOWN

WN 3013 · BOS → STL

took off 5:50 AM ET · landed 7:10 AM CT (scheduled time unknown)
Forecast issued Wed 10:00 PM ET · 16h after departure

Odds over time

Arrive at STL more than 15 minutes late?
6% 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% 3% 6% 9% 12% 1.0d 12h 6h Departs Lands