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 2122 LANDED 12:37 AM CT, ~5 MIN LATE · SCHEDULED TIME UNKNOWN
Yesterday

WN 2122 · HOU → SAT

took off 12:01 AM CT · landed 12:37 AM CT (scheduled time unknown)
Forecast issued Sat 10:00 PM ET · 21h after departure

Odds over time

Arrive at SAT more than 15 minutes late?
25% chance · ±0 pts +3 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