Emile Hirsch
Christopher McCandless / Alexander Supertramp
Marcia Gay Harden
Billie McCandless
William Hurt
Walt McCandless
Jena Malone
Carine McCandless / Additional Narration (voice)
Brian H. Dierker
Rainey
Catherine Keener
Jan Burres
Vince Vaughn
Wayne Westerberg
Kristen Stewart
Tracy Tatro
Hal Holbrook
Ronald "Ron" Franz
Thure Lindhardt
Mads
Signe Egholm Olsen
Sonja
Jim Gallien
Jim Gallien
James J. O'Neill
Graduation Reader
Malinda McCollum
Waitress
Paul Knauls
Building Manager
Zach Galifianakis
Kevin
Craig Mutsch
Wayne's Crew #1
Jim Beidler
Wayne's Crew #2
John Decker
Hutterite #1
John Hofer
Hutterite #2
Jerry Hofer
Hutterite #3
Terry Waldner
Hutterite #4
Robin Mathews
Gail Borah
Candice Campos
Bar Girl
Steven Wiig
Lee's Ferry Ranger
Floyd Wall
Man In Phone Booth
Bryce Walters
Christopher McCandless (age 4)
Jim Davis
Immigration Officer
Cheryl Francis Harrington
Social Worker
R. D. Call
Bull
Haley Ramm
Carine McCandless (age 11)
Merritt Wever
Lori
Everett 'Insane Wayne' Smith
Insane Cain
John Jabaley
Announcer
Leonard Knight
Leonard Knight
Matt Contreras
Book Shopper #1
Denise Sitton
Book Shopper #2
Sharon Olds
Additional Narration (voice)
Carine McCandless
Additional Narration (voice)
J. Nathan Simmons
Tourist (uncredited)
Parris Mosteller
Young Boy (voice) (uncredited)
Timothy Levine
Atlanta Braves fan (uncredited)
Haley Sweet
Bank Teller (uncredited)
Aaron Wayne Hill
Big Wheel Boy (uncredited)
Bart the Bear 2
Bear