Career
He has previously played for Street Johnstone and Queen of the South, as well as Arbroath, Stranraer and Elgin City on loan. Early career
Durnan started his career in the youth team of Clyde, before moving to Street Johnstone in 2008, but in his time at Street Johnstone he failed to make a first team appearance for the club While at Street Johnstone, he went out on loan a number of times, firstly in August 2010, when he moved to Arbroath.
The following season he was loaned to Stranraer on 23 August 2011, for one month and on 11 January 2012, he joined Elgin City for the rest of the season.
Queen of the South
On 25 July 2012, Durnan signed for Second Division club Queen of the South, signing a one-year contract. On 19 April 2013, he signed a new one-year contract with the club
At the end of the season, Durnan was one of six Queen of the South players named in the PFA Scotland 2012-2013 Second Division Team of the Year. On 7 January 2014, Durnan extended his contract by a further year, until 2015.
Dundee United
In June 2015, Durnan signed a three year contract with Dundee United.