Born in Schio, Cavion started his professional career in Vicenza. On 15 December 2012, Cavion made his professional debut for Vicenza as a substitute replacing Gianvito Plasmati in the 72nd minute of a 2–0 away defeat against Empoli.
On 5 July 2013, Cavion was signed by Serie C side Reggiana on a season-long loan deal. On 1 September he made his Serie C debut for Reggiana in a 1–1 away draw against Südtirol, he was replaced by Paolo Zanetti in the 71st minute. On 21 October, Cavion played his first entire match for Reggiana, and he scored his first professional goal in the 70th minute of a 3–2 home defeat against AlbinoLeffe. Cavion ended his season-long loan to Reggiana with 27 appearances, 1 goal and 1 assist.
On 17 July 2014, Cavion was signed by Serie C club FeralpiSalò along with Marco Di Benedetto. On 10 August he made his debut for FeralpiSalò as a substitute replacing Marco Di Benedetto in the 67th minute of a 1–0 home win over Santarcangelo in the first round of Coppa Italia. On 17 August he played in the second round as a substitute replacing Andrea Cittadino in the 85th minute of a 2–0 away defeat against Perugia. On 31 August he made his Serie C debut for FeralpiSalò as a substitute replacing Mattia Broli in the 27th minute of a 1–0 home win over Real Vicenza. On 6 September, Cavion played his first match as a starter for FeralpiSalò, a 1–0 away defeat against Novara, he was replaced by Juan Antonio in the 80th minute. On 14 September, Cavion played his first entire match for FeralpiSalò and he scored his first goal in the 18th minute of a 3–1 away defeat against Pavia. Cavion ended his loan to FeralpiSalò with 36 appearances and 2 goals.
Loan to Carrarese
On 31 August 2015, Cavion was loaned to Serie C side Carrarese on a season-long loan deal. On 6 September he made his Serie C debut for Carrarese as a substitute replacing Emanuel Gyasi in the 72nd minute of a 1–1 away draw against Robur Siena. On 26 September, Cavion played his first match as a starter for Carrarese but he was send off with a red card in the 74th minute of a 1–0 home win over Tuttocuoio. On 29 October he played his first entire match for Carrarese, a 1–1 away draw against Savona. On 8 May he scored his first goal for Carrarese in the 39th minute of a 5–4 away win over Lucchese. Cavion ended his season-long loan to Carrarese with 32 appearances, 1 goal and 3 assists.
On 5 July 2016, Cavion was signed by Serie C club Cremonese on a season-long loan deal. On 31 July, Cavion made his debut for Cremonese in a 4–3 home win over Fermana, he was replaced by Fabio Scarsella in the 62nd minute. On 7 August, Chiavon played in the second round and he was replaced by Filippo Porcari in the 55th minute of a 2–1 away win over Cittadella. On 13 August he played in the third round as a substitute replacing Luca Belingheri in the 54th minute of a 3–0 away defeat against Atalanta. On 28 August he made his Serie C debut for Cremonese as a substitute replacing Fabio Scarsella in the 72nd minute of a 0–0 away draw against Viterbese Castrense. On 16 October, Cavion played his first match as a starter and he scored his first goal for Cremonese in the 48th minute of a 2–1 home win over Olbia, he was replaced in the 49th minute by Fabio Scarsella. On 30 October he plated his first entire match for Cremonese, a 2–1 home win over Pistoiese. Cavion ended his loan to Cremonese with 29 appearances, 1 goal and 3 assists. At the end of the season Cremonese won the Serie C title and it was promoted in Serie B.
Cremonese
After his contract with Juve expired on 30 June 2017 Cavion signed with newly Serie B promoted team Cremonese with a 2-year contract. Cavion started this season on 6 August with a 1–0 away win over Virtus Entella in the second round of Coppa Italia, he played the entire match. On 12 August, Cavion played in the third round as a substitute replacing Daniele Croce in the 69th minute of a 2–1 away defeat against Bari. On 25 August, Cavion made his Serie B debut as a substitute replacing Mariano Arini in the 62nd minute of a 1–0 away defeat against Parma. On 9 September he played his first entire match of the season and he scored his first Serie B goal in the 81st minute of a 4–1 away win over Pro Vercelli. On 14 October, Cavion scored his second goal in the 96th minute of a 2–1 away win over Cittadella. On 20 December he scored his third goal in the 60th minute of a 1–1 away draw against Venezia. Cavion ended the season with 39 appearances, 6 goals and 2 assists.
Ascoli
After only one season at Cremonese, Cavion, on 19 July 2018, joined to Serie B side Ascoli.
