1 Thigh liposuction typically costs $2,000 to $6,500 for one area -- either inner, outer or back -- on both thighs, or $7,000 or more for multiple areas on both thighs -- such as inner and outer or inner, outer and back. For patients who get liposuction on multiple parts of the thighs, there is usually a multiple-procedure discount. 2  For example, Hollywood Liposculpture charges $3,700 for inner and outer thighs or $7,300 for full thighs (inner, outer and tops) and knees.