[1] Urbonas made his professional debut in the 1993–94 season and continued to play for various teams in the Lithuanian Basketball League for another eight years, playing for BC Lietkabelis, BC Lavera, being one of the team leaders there, before signing with BC Šiauliai, where he reached his biggest success, helping the team finish in 3rd place in 2000 and 2001, and becoming the LKL MVP in the 2001 season.

Urbonas returned to Lithuania in 2007 and played there until autumn 2008 before signing with Donetsk of the Ukrainian Basketball SuperLeague for the 2008–2009 season.

[2] In 2009, Urbonas became a player-coach and the team's president when he joined Juventus Utena,[3] and then became the assistant coach when he retired in 2012.

He served as head coach under Rytis Vaišvila, Vitoldas Masalskis, Virginijus Sirvydis and Antanas Sireika, who coached and mentored him back during his playing days in BC Šiauliai.

Urbonas won a gold medal with the Lithuanian under-18 national team in 1994 FIBA Europe Under-18 Championship.