He said he was overwhelmed with the support he had received from friends and family who travelled to Auckland for the finals.
Auckland soprano Isabella Moore was crowned winner and south Auckland baritone Benson Wilson second. Mr Thurston also performed Rachmaninoff's When Yesterday We Met accompanied by pianist Terence Dennis and Avant de quitter ces lieux from Gounod's Faust.
Mr Thurston receives a study scholarship of $5000 and a cash prize of $5000. Finalists each receive cash prizes of $3500. He is part of the New Zealand Opera Emerging Artists internship and next year will audition for performing arts schools in the United States, including Juilliard.
The Lexus Song Quest has launched the careers of some of New Zealand's most celebrated opera stars including Dames Kiri Te Kanawa and Dame Malvina Major, Jonathan Lemalu, Madeleine Pierard and Phillip Rhodes.
Now studying in a prestigious UK opera school, 2012 winner Amitai Pati is one third of the hugely successful trio Sol3 Mio, whose record went platinum and bested Lorde by becoming New Zealand's biggest selling album of 2013.
Mr Thurston will perform alongside the second and first placegetters tonight at the Lexus Recital Concert at the Opera House in Wellington.