Born and raised in Taupo, New Zealand, where both of her parents were English teachers at a local college. Flynn has two siblings; sister Tessa, and brother Todd, and is the eldest of the 3 children. She completed a Bachelor of MediArts majoring in journalism from Waikato Polytech (now WINTEC) and a Diploma in Journalism from the Journalists Training Organisation.
She married cameraman Dave Flynn on Sunday, 22 October 2006. In February 2010, she was asked by Sunrise co-host Oliver Driver to announce that she is expecting her first child. On 30 June 2010, the Flynns had a baby girl they named Tilly Zoe Flynn.
She gave birth to her second child in February 2012.
Flynn is currently pregnant and expecting her third child with husband Dave, due in early March 2017.
Flynn began her career in print journalism for the Herald community group newspapers before working for Counties Manukau Radio station then reporting, presenting and producing for Prime TV’s Waikato and Bay of Plenty regional news.
She travelled extensively, with a stint living and working in Dublin where she worked for local radio station Newstalk 106 as well as You're A Star, an Irish pop star programme, before returning to New Zealand where she began as a reporter for 3 News.
She presented NZ News Week, a half-hour weekly wrap of New Zealand's top news stories, produced by TV3 for Sky News Australia and the TV3 website, before this was discontinued in early 2007.
On 14 March 2005, Flynn took over as the presenter on TV3's late-night news programme Nightline, replacing long-time TV3 presenter Carolyn Robinson, who became 3 News' weekend presenter. Flynn also continued to file reports for the show at the same time as presenting.
Flynn left the role at Nightline on 7 September 2007 to host TV3's short lived breakfast show, Sunrise. Sunrise began on 2 October 2007 and she co-hosted the show with James Coleman, but from 6 October 2008 she began hosting alongside new presenter Oliver Driver. Sunrise went off the air on 8 April 2010 as it was not financially sustainable.
In 2012, she was appointed as co-host of TV3 consumer affairs show Target alongside Brooke Howard-Smith taking over for Janette Thomas. Target has been on hiatus since 2013.