At one point, the protesters spilled out onto Century Boulevard, blocking cars trying to enter LAX.
However, police were able to move the protest back onto sidewalks and traffic continued to flow normally.
Flying Food Group employees called on the city of Los Angeles to hold the "serial lawbreaker" catering company accountable for its treatment of workers.
"The conditions, from pipes bursting to blocked exits, and chemical burns are outrageous. I want a workplace where I feel safe. We ask the city to hold Flying Food Group accountable," said a statement from Lilian Rosales, a flight coordinator of 15 years.
Workers also filed complaints with Cal/OSHA, alleging they have seen multiple health and safety problems.
Among the problems workers cited were apparent fire alarm malfunctions, chemical burns, burst overhead pipes and flooded workspaces.
"Despite the growing number of problems - and despite workers repeatedly raising these concerns - the leadership of Los Angeles World Airports has failed to take meaningful action to hold Flying Food Group accountable to the City's own requirements for its licensees," said a statement from Susan Minato, co-president of UNITE HERE Local 11. "We need accountability from the city."
Flying Food Group supplies food for airlines like Air France, Lufthansa, Japan Airlines, and Hawaiian Airlines.
According to the statement from the union, the catering company has been issued citations or complaints by five different agencies in the last several years.