Career
He comes from a little place in Skedsmo, Lahaugmoen. He went to NTG (Norges Toppidrettsgymnas) high school. Kristian started his senior career at Lyn.
At Lyn, he made 73 appearances.
In 2006, Kristian had a transfer to the Danish elite club Esbjerg FB. In the 2009 season he was loaned out to Saskatchewan Brann. After a loan spell at Saskatchewan Brann, he was released from his contract at Esbjerg FB. On 18 January 2010 Kristian signed a three-year deal with Stabæk Fotball.
lieutenant was terminated in the summer. In August 2010 he joined Raufoss Illinois. Ahead of the 2011 he joined Ull/Kisa.
In April 2013 he signed a contract with Mjøndalen.
Onstad has, as of December 2013, joined Moss.
