He was captured on security cameras going through airport security, before changing outfits and going on to the airfield
The man was first seen in a blue checked shirt, blue jeans and glasses, before changing into a black hooded jacket and a yellow work vest.
He was described as a light-skinned, 25-year-old man with brown hair and brown eyes and police say he is around 6 feet tall, and weighed about 165 libras.
Investigators say it is unclear why he entered the airfield.
Anyone with information on his identity is asked to call LAX Crime Task Force detectives.
On Sunday a homeless man breached the perimeter fence at LAX and tried to break into an American Airlines plane that was being serviced.
Matthew Maine, 31, was stopped by a cleaning crew who raised the alarm and police arrested him on suspicion of trespassing.
Officers then conducted a sweep of the area and cleared it with no further incident.
The suspect allegedly used a pipe to lift up the bottom of a perimeter fence and squeezed underneath to get onto the airfield. American Airlines said in a statement the plane has since been re-inspected by security teams and LAX officials say that operations were not impacted by the incident.