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 1123 LANDED 11:07 PM CT, ~11 MIN LATE · SCHEDULED TIME UNKNOWN

WN 1123 · TPA → STL

took off 10:08 PM ET · landed 11:07 PM CT (scheduled time unknown)
Forecast issued Fri 10:00 PM ET · 0h before departure

Odds over time

Arrive at STL more than 15 minutes late?
35% chance · ±1 pts – · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
LIVE IN THE AIR 0% 15% 30% 45% 60% 1h Now Departs Lands