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 2940 LANDED 8:15 PM CT, ~5 MIN LATE · SCHEDULED TIME UNKNOWN

WN 2940 · SMF → STL

took off 3:02 PM PT · landed 8:15 PM CT (scheduled time unknown)
Forecast issued Fri 10:00 PM ET · 4h after departure

Odds over time

Arrive at STL more than 15 minutes late?
31% 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% 1h Departs Lands