Lukaku was in California with Paul Pogba to complete a United medical in July and held parties while on the trip.
The Belgian was given a misdemeanor citation by a police officer after the incidents for excessive noise and was due in court in Los Angeles on October 2 in response to the complaints.
The charge will be reduced to a disturbance of the peace infraction, however, once Lukaku pays the fine, a commissioner overseeing the 24-year-old's case said.
"They are reaching a disposition in this case that the first thing that must happen is the defendant must pay Beverly Hills Police Department $450 for multiple response calls," Jane Godfrey added.
Lukaku and Pogba both scored in the Old Trafford club's 4-1 win over Newcastle United last weekend.