Dallas was born in Phoenix, Arizona, and attended Arizona School for the Arts. He has two younger brothers and one younger sister.

He became interested in acting at the age of 12, when his grandmother took him to a production of the play The Ugly Duckling.

Dallas has starred in several films, including Babysitter Wanted, as well as the title character in the ABC Family television series Kyle XY for three seasons.

The series ended on March 16, 2009 after it was canceled by ABC. Dallas also appeared in Living The Dream, Wannabe, Camp Daze, and Way of The Vampire. He has been a guest on the TV show Entourage.

In 2004, Dallas starred in Fan 3's music video for "Geek Love". In 2005, Dallas starred with Mischa Barton in James Blunt's music video for "Goodbye My Lover" and in 2008 he starred in Katy Perry's music video for "Thinking of You".

Dallas was cast in ABC's Eastwick, playing Roxie's (Rebecca Romijn) love interest.

On November 9, 2009, ABC declined to order any additional episodes of Eastwick, effectively cancelling the series.

In 2009, it was announced that Dallas would be doing the movie, Beauty and the Briefcase with Hilary Duff.

Dallas was in an indie western film called The First Ride of Wyatt Earp as Bat Masterson, which was released on March 6, 2012.

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