Christopher McCandless / Alexander Supertramp
Billie McCandless
Walt McCandless
Carine McCandless / Additional Narration (voice)
Rainey
Jan Burres
Wayne Westerberg
Tracy Tatro
Ronald "Ron" Franz
Mads
Sonja
Jim Gallien
Graduation Reader
Waitress
Building Manager
Kevin
Wayne's Crew #1
Wayne's Crew #2
Hutterite #1
Hutterite #2
Hutterite #3
Hutterite #4
Gail Borah
Bar Girl
Lee's Ferry Ranger
Man In Phone Booth
Christopher McCandless (age 4)
Immigration Officer
Social Worker
Bull
Carine McCandless (age 11)
Lori
Insane Cain
Announcer
Leonard Knight
Book Shopper #1
Book Shopper #2
Additional Narration (voice)
Tourist (uncredited)
Young Boy (voice) (uncredited)
Atlanta Braves fan (uncredited)
Bank Teller (uncredited)
Big Wheel Boy (uncredited)
Bear