Airport officials did not have an immediate estimate for when the ground stop would be lifted. The order did not prevent arriving flights from landing, said LAX spokeswoman Amanda Parson.
She did not know how many flights were affected by the FAA's request, which was made around 2 p.m.
Incoming flights were reportedly being diverted to other airports not affected by the glitch, disrupting travel plans.
An FAA representative could not immediately be reached for comment.
Airport officials urged passengers to check with their individual airlines for flight information.