Born in Plovdiv, Bulgaria, Yoncheva did not have a conventional childhood. Since the age of 6, she was already "working", according to her own words from an interview for Metropolis. She studied piano and voice at the National School for Music and Dance in Plovdiv. During her teenage years, she hosted a Bulgarian television show about music. She won several music competitions in Bulgaria in 2000 and 2001, including a joint win with her brother as "Singers of the Year 2000" in the "Hit-1" competition organised and produced by Bulgarian National Television.
Yoncheva was an invited participant in William Christie's "Jardin des Voix" academy for young singers in 2007. She has continued work in the baroque repertoire with Christie, and also with Le Concert d'Astrée and Emmanuelle Haïm. Yoncheva was the female first-place winner of the 2010 Operalia competition. Her debut at the Metropolitan Opera was in November 2013 when she stepped in as Gilda in Rigoletto, in advance of her previously scheduled official debut. In 2014 at the Met, she sang her stage role debut as Mimì (La bohème) in November and shared the role of Violetta (La traviata) in December. In 2015 she appeared as Desdemona in Otello and in September 2016 she made her debut as Norma at the Royal Opera House. She will debut in the title role of Puccini's "Tosca" in concert with the Philadelphia Orchestra for their 2017/18 season.
Yoncheva is featured on commercial recordings on the Virgin Classics label. In November 2013, she signed a recording contract with Sony Classical. She also appears in commercial DVD releases of Claudio Monteverdi's L'incoronazione di Poppea and Il ritorno d'Ulisse in patria, and of Giovanni Battista Pergolesi's Il Flaminio. Additionally, she is featured on Pergolesi's "Stabat Mater" and Mozart's "Le Nozze di Figaro" on Deutsche Grammophon.
Her first solo album, the audio CD Paris mon amour (Sony Classical) came out on January 13, 2015, followed by another solo album titled "Handel" (Sony Classical) released on February 3, 2017.
Yoncheva and her husband Domingo Hindoyan, a Venezuelan conductor, live in the canton of Vaud, Switzerland. The couple have a son, Mateo, born 6 October 2014. Her younger brother Marin Yonchev is a rock singer.
- Martina Müller (2016-01-11). "Die bulgarische Sopranistin Sonya Yoncheva". Metropolis. Retrieved 2016-08-25.
- Michael Cooper (2014-11-27). "A Last-Minute Sensation". The New York Times. Retrieved 2014-12-26.
- Naxos Records. "Danielle Borst". Naxos Records. Retrieved 2016-08-25.
- Martin Cullingford (2013-11-15). "Soprano Sonya Yoncheva signs to Sony Classical". Gramophone. Retrieved 2014-12-26.
- "Bulgarian soprano and Romanian tenor triumph in Operalia". Gramophone. 2010-05-04. Retrieved 2014-12-26.
- Anthony Tommasini (2013-12-07). "Musical Chairs at the Met". The New York Times. Retrieved 2014-12-26.
- Performance schedule at Operabase
- Nicholas Kenyon (2012-04-21). "Rameau, Lully, Purcell, Handel: Une fête Baroque! – review". The Observer. Retrieved 2014-12-26.