Colin Farrell as David

Margot Robbie as Sarah

Jennifer Grant as David's Mother

Hamish Linklater as David's Father

Phoebe Waller-Bridge as Female Cashier

Kevin Kline as The Mechanic

Jodie Turner-Smith as GPS (voice)

Lily Rabe as Sarah's Mother

Billy Magnussen as The Man

Chloe East as Cheryl

Lucy Thomas as Amanda

Sarah Gadon as The Woman

Brandon Perea as Mike

Calahan Skogman as Sarah's Groomsman

Jacqueline Novak as Stacy Dunn

Michelle Mao as Smitty

Jason Kravits as Mr. Nelson

Shelby Simmons as Stage Manager

Simon Khan as Tate Chandler

Yuvi Hecht as Young David

Mike Meldman as Father of the Bride

Pablo Soriano as Vincent

Galen Hooks as Choreographer

Brooke Maroon as Amy Moore

Julian Zane as Eddie Bora

Liz Jenkins as Another Mother

Gabriella Surodjawan as Miss Jones

Joyce Guy as Doctor Vernon

Karah Donovan as Nurse

Mia-Carina Mollicone as Hotel Receptionist

Aaron Quini as Student Performer

Carissa Rae Martin as Student Performer

Jarvis Langster as Student Performer

John Arthur Mays as Student Performer

Kayla LaVine as Student Performer

Mariah Spears as Student Performer

Phi VoBa as Student Performer

Danielle Kennedy as Old Woman (uncredited)

Floriane Andersen as Officiant (uncredited)

Bernadette Balagtas as Nan (uncredited)

Kyle Burnett as Groomsman (uncredited)

Jacob John Caldwell as Clarinet Player (uncredited)

Greg Collins as Parent (uncredited)

Vince Corea as Student (uncredited)

Nadia Dawn as Wedding Guest (uncredited)

Taylor Deetz as Student (uncredited)

Mike Hartsfield as Concerned Parent (uncredited)

Ksenie Kolbas as Groomsman Girl (uncredited)

Erik Lunseth as Dr. Johnson (uncredited)

Marion Maclou as Student (uncredited)

Ronnie J. Salazar as Theatre Audience (uncredited)

Susan Elizabeth Shaw as Bridesmaid (uncredited)

Thomas Spaeter as Concert Guest (uncredited)

Ara Storm as Student (uncredited)

London Stubblefield as Parent (uncredited)

Neil Wachs as Parent (uncredited)

Jennifer Woods as Wedding Guest (uncredited)

Michael Sullivan as Parent (uncredited)