Flintridge Prep is a charter member of the Western Association of Schools and Colleges and is accredited for six-year terms. It holds memberships in the California Association of Independent Schools, the National Association of Independent Schools, the College Entrance Examination Board, the National Association of College Admission Counselors, the Western Association of College Admission Counselors, the Cum Laude Society, and the Educational Records Bureau. Flintridge complies with the National Association for College Admission Counseling's Statement of Principles of Good Practice. It also participates in the American Field Service and The Independent School Alliance for Minority Affairs.
Admission is selective.
In 2000, there were 259 applications for 56 spaces in grade 7, and 266 applications for 48 spaces in grade 9. A few spaces in other grades become available through attrition. Semester system, four grading periods per year with grades recorded at the end of each course. A year course yields 1 credit in that subject. Students normally take 5 credits each year.