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 3911 LANDED 10:17 PM CT, ~4 MIN LATE · SCHEDULED TIME UNKNOWN
Yesterday

WN 3911 · SAN → SAT

took off 6:05 PM PT · landed 10:17 PM CT (scheduled time unknown)
Forecast issued Tue 10:00 PM ET · 1h after departure

Odds over time

Arrive at SAT more than 15 minutes late?
39% chance · ±0 pts +11 pts · 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% 1.0d 12h 6h Departs Lands