Rollebesetning

• Emile Hirsch — Christopher McCandless / Alexander Supertramp
• Marcia Gay Harden — Billie McCandless
• William Hurt — Walt McCandless
• Jena Malone — Carine McCandless
• Catherine Keener — Jan Burres
• Vince Vaughn — Wayne Westerberg
• Kristen Stewart — Tracy Tatro
• Hal Holbrook — Ronald "Ron" Franz
• Zach Galifianakis — Kevin
• Signe Egholm Olsen — Sonja
• Haley Ramm — Carine McCandless (age 11)
• John Jabaley — Announcer
• Signe Egholm Olsen — Sonja
• Merritt Wever — Lori
• Cheryl Francis Harrington — Social Worker