David

Colin Farrell

Sarah

Margot Robbie

David's Mother

Jennifer Grant

The Mechanic

Kevin Kline

Female Cashier

Phoebe Waller-Bridge

David's Father

Hamish Linklater

Sarah's Mother

Lily Rabe

GPS (voice)

Jodie Turner-Smith

Amanda

Lucy Thomas

The Man

Billy Magnussen

Cheryl

Chloe East

Young David

Yuvi Hecht

The Woman

Sarah Gadon

Mike

Brandon Perea

Stage Manager

Shelby Simmons

Mr. Nelson

Jason Kravits

Stacy Dunn

Jacqueline Novak

Father of the Bride

Mike Meldman

Sarah's Groomsman

Calahan Skogman

Vincent

Pablo Soriano

Choreographer

Galen Hooks

Smitty

Michelle Mao

Tate Chandler

Simon Khan

Amy Moore

Brooke Maroon

Eddie Bora

Julian Zane

Another Mother

Liz Jenkins

Miss Jones

Gabriella Surodjawan

Doctor Vernon

Joyce Guy

Nurse

Karah Donovan

Hotel Receptionist

Mia-Carina Mollicone

Student Performer

Aaron Quini

Student Performer

Carissa Rae Martin

Student Performer

Jarvis Langster

Student Performer

John Arthur Mays

Student Performer

Kayla LaVine

Student Performer

Mariah Spears

Student Performer

Phi VoBa