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 2105 LANDED 8:58 AM CT, ~3 MIN LATE · SCHEDULED TIME UNKNOWN
Yesterday

WN 2105 · SAT → STL

took off 7:20 AM CT · landed 8:58 AM CT (scheduled time unknown)
Forecast issued Sat 10:00 PM ET · 14h after departure

Odds over time

Arrive at STL more than 15 minutes late?
6% chance · ±0 pts – · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
LIVE IN THE AIR 0% 5% 10% 15% 20% 4h Departs Lands