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 1073 IN THE AIR (OFF 2:30 PM ET, ETA 4:28 PM PT) · SCHEDULED TIME UNKNOWN
Today

WN 1073 · BWI → SAN

took off 2:30 PM ET · expected to land 4:28 PM PT (scheduled time unknown)
Forecast issued Tue 4:00 PM ET · 2h after departure

Odds over time

Arrive at SAN more than 15 minutes late?
31% chance · ±2 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% 10h 6h Departs Lands