Keira Knightley

as Megan Burch

Chloë Grace Moretz

as Annika Hunter

Sam Rockwell

as Craig Hunter

Kaitlyn Dever

as Misty

Ellie Kemper

as Allison

Mark Webber

as Anthony

Jeff Garlin

as Ed Burch

Daniel Zovatto

as Junior

Dylan Arnold

as Patrick

Gretchen Mol

as Bethany

Sara Coates

as Savannah

Jodi Thelen

as Linda Burch

Kirsten deLohr Helland

as Danielle

Eric Riedmann

as Matt

Louis Hobson

as Theo

Amy Thone

as Mrs. Halpsky

Rocki DuCharme

as Teen Savannah

Sara Lynne Wright

as Teen Allison

Larissa Schmitz

as Teen Megan

Phillip Abraham

as Teen Anthony

Maura Lindsay

as Teen Danielle

Basil Harris

as Wedding DJ

Zoe McLane

as Sophomore Girl

Jasmin Savoy Brown

as Music Kid

Joey Ally

as Espresso Server

Bhama Roget

as Airport Gate Agent

Omar Silva

as Bartender

Rachelle Henry

as Junior Bridesmaid #1

Kyle Love

as Dan (uncredited)