Shannon Purser as Sierra Burgess

Kristine Froseth as Veronica

Noah Centineo as Jamey

RJ Cyler as Dan

Chrissy Metz as Veronica's Mom

Alice Lee as Mackenzie

Giorgia Whigham as Chrissy

Will Peltz as Spence

Mario Revolori as Rishi

Joey Morgan as Topher

JT Neal as Mike

Brandon Thomas Lee as Brent

Lea Thompson as Mrs. Burgess

Alan Ruck as Mr. Burgess

Loretta Devine as Ms. Thomson

Mary Pat Gleason as Counselor Stevens

Wolfgang Novogratz as Drew

Joey Bell as Kenny Chan

Elizabeth Tovey as Brody

Shoniqua Shandai as Brandy

Mariam Tovey as Scooter

Ashton Smiley as Drunk Girl

Matt Malloy as Biology Teacher

Geoff Stults as Coach Johnson

Jaret Martino as Prom Date (uncredited)