Joey King as Clare Shannon

Ki Hong Lee as Ryan Hui

Sydney Park as Meredith McNeil

Shannon Purser as June Acosta

Sherilyn Fenn as Mrs. Deluca

Elisabeth Röhm as Johanna Shannon

Ryan Phillippe as Jonathan Shannon

Mitchell Slaggert as Paul Middlebrook

Josephine Langford as Darcie Chapman

Alice Lee as Gina

Alexander Nunez as Tyler Manguso

Daniela Barbosa as Lola Sanchez

Kevin Hanchard as Carl Morris

Raegan Revord as Young Claire

Victor Sutton as Uncle August

Albert Chung as Roland Moon

Michelle Alexander as House Manager

Natalie Prinzen-Klages as Twin #1

Nora Prinzen-Klages as Twin #2

Monique Stinchcombe as Freshman #1

Danielle Pollari as Freshman #2

Rosalina Lee as Spa Technician

Ryan Taerk as Ryan's Friend

Jerry O'Connell as Lawrence Hart (uncredited)

Sean Jones as Highschool Student (uncredited)

Jake Gosden as Highschool Student (uncredited)