Elfyn was born in Bangor, Gwynedd, was brought up in Newtown, Powys, and now lives in Cardiff with her husband, Clwb Ifor Bach Promoter and Works Manager Richard Hawkins. They had a daughter, Tegan, in February 2012, and a second daughter in December 2016.
Elfyn is a fluent Welsh speaker and has appeared as a panellist on Welsh-language channel S4C's music talent show Waw Ffactor. She co-hosted Radio 1's first Welsh-language programme as part of the oneclick strand in August 2005 with Aled Haydn-Jones from The Chris Moyles Show.
Elfyn co-presented the Wales programme on BBC Radio 1 with Huw Stephens as part of the station's regional output every Thursday evening. She joined Radio 1 in 1999 as part of the aforementioned new regional output, and left in 2010 after 11 years at the station. She also produced[clarification needed] other programmes for the station.
She currently presents the Saturday evening show for BBC Radio Wales on the current Welsh music scene, with live sessions, interviews and a mix of classic rock and pop. Elfyn also presents The Bethan Elfyn Show on Amazing Radio where she features a range of music from new and emerging artists. She also appears occasionally on BBC 6 Music as cover for presenters including Lauren Laverne.
Elfyn is also one of the architects of the BBC/Wales Arts Council programme Horizons/Gorwelion, supporting new Welsh bands. The programme was established in 2014.
- BBC - Wales Music: Greetings from Bethan
- DJ Bethan Elfyn to leave Radio 1 - Showbiz - Lifestyle - WalesOnline
- BBC - BBC Radio Wales Programmes - Bethan Elfyn
- Amazing Radio signs former Radio 1 DJs : Radio Today
- The Bethan Elfyn Show « Amazing Radio Archived November 2, 2011, at the Wayback Machine.
- BBC - BBC Radio 6 Music Programmes - Lauren Laverne, Bethan Elfyn sits in