Stefan Lončar

Sutjeska

Lončar made his professional debut with hometown team Sutjeska. In September 2016, he joined Serbian team FK Rad on the last day of the summer transfer window. After six months at Rad, Lončar didn't play a game and returned to Sutjeska. After two more seasons at Sutjeska, he was recognized as the best player of the Montenegrin First League in 2018.

Alavés

Loan to Istra 1961

On 20 January 2019, it was announced that Lončar signed a contract with Spanish club Alavés, lasting until the summer of 2021. Upon signing, he was immediately sent on a one-season loan to Croatian club Istra 1961, whose ownership was bought by Alavés in the summer of 2018. On 29 September 2019, he scored his first goal for Istra in a 1–1 tie with Hajduk Split.

Debrecen

On 10 January 2023, Lončar moved to Debrecen in Hungary. On 31 July 2023, he scored two goals against Mezőkövesdi SE on the first match day of the 2023–24 Nemzeti Bajnokság I season. The final result was a 3–1 victory for Debrecen.

Akron Tolyatti

On 24 June 2024, Lončar signed a contract with the Russian Premier League newcomers Akron Tolyatti. On 15 July 2026, his contract with Akron was extended to 2028.

On 28 May 2018, Lončar made his international debut for Montenegro in an exhibition match Bosnia and Herzegovina which ended in a 0–0 tie.

As of match played 9 October 2026

International

As of matches played on 5 October 2026

Individual

Nemzeti Bajnokság I Goal of the Month: September 2023