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.

AVIANCA EL SALVADOR · FLIGHT TA 558 SCHEDULED · SCHEDULED TIME UNKNOWN
Today

TA 558 · SAL → SFO

departs 12:00 AM CST · arrives 4:19 AM PT
Your aircraft is N962AV (A20N).
Forecast issued Fri 8:00 AM ET · 7h after departure

Odds over time

Arrive at SFO more than 15 minutes late?
28% chance · ±0 pts – · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
LIVE IN THE AIR 0% 15% 30% 45% 60% 7h 6h Departs Lands