He studied oboe in primary school at the Arts High School in Suceava. After he graduated the theoretical high school “Constantin Brancoveanu” in Bucharest in 2001 (Philology section), he attended the Bucharest University of Music (Byzantine Music), graduating in 2006. Also, while in college, he was hired by the Bucharest National Opera’s choir and receives his first small roles. Also in 2006, he started taking singing lessons with Corneliu Fanateanu.
Beginning with 2006, he started singing at the Romanian National Opera, Bucharest, where he made his debut in „Puss in Boots” by Cornel Trăilescu, as Ionică. During his stay here, he took part in several masterclasses held by soprano Leontina Văduva (2007), mezzo Viorica Cortez (2008) and baritone Eduard Tumagian (2010).
In 2008 Ilincăi he was invited by the “Banatul” Philharmonics in Timişoara for Stabat Mater (Rossini), making his debut in a vocal-symphonic work. In the same year he also appears for the first time on the stage of the Bucharest Romanian Athenaeum in Dvorak’s Requiem and made his debut with the tenor’s part in Carmina Burana (Orff) at Bucharest Opera House and Radio Concert Hall.
His international debut took place in January 2009 at the Hamburg State Opera (MacDuff in G. Verdi’s Macbeth). In March 2009, he made his debut at Vienna State Opera (Ismaele in Verdi's Nabucco). His debut in Puccini’s La Bohème in Timişoara, Bucharest and Hannover followed. In December 2009, he made his debut at Royal Opera House in London with La Bohème, under John Copley’s stage direction.
- First place in the Tenor’s competition in Szczecin – Poland (2008)
- Soloist of the year offered by Bucharest VIP Gala Awards (2009)
- Ludovic Spiess prize, awarded by Romanian Music Forum (2009)
- In memoriam Iosif Sava distinction for his activity in 2009, offered by Radio Romania Cultural (2010)
- Second place at the “Francisco Viñas” international singing competition - Barcelona (2010)
- Pinkerton – Madama Butterfly
- Lensky– Eugene Onegin
- Ismaele– Nabuco
- Faust – Faust
- Rodolfo – La Boheme
- Romeo – Romeo et Juliette
- Alfredo – La Traviata
- MacDuff – Macbeth
- Tebaldo - I Capuleti e i Montecchi
- Cassio - Otello
- Calaf - Turandot
- "Teodor Ilincăi, official website"
- "La Bohème at Royal Opera House", by Andrew Clements The Guardian (4 January 2010)
- "Concert at Miguel Delibes Auditorium, Valladolid" Archived 2013-02-13 at Archive.today, Adevarul.es (17 May 2011)
- "Szczecin Opera Contest"
- "Gala Premiilor VIP 2009" Archived 2014-01-03 at the Wayback Machine
- "Premiile Forumului Muzical Roman", Hotnews
- "Premiile Radio Romania Cultural", Hotnews
- "Francisco Viñas International Singing Competition"
- "La Boheme at Royal Opera House - DVD", Presto Classical
- "La Boheme at Royal Opera House - Blu-ray", Presto Classical