He had previously played in the Norwegian Premier League with Lillestrøm SK and has represented his country on 9 occasions.

He signed for Swedish Superettan club Östers IF on a three-year contract in December 2009 [1].

On 14 August 2012, Viðarsson joined Danish 1st Division side Vejle Boldklub Kolding on a two-year contract.

Davíð is the brother of fellow Icelandic midfielders Arnar and Bjarni.

This biographical article related to association football in Iceland is a stub.