He has won the national championship and is the reigning gold medalist in Kun Khmer at the Southeast Asian Games in the 75 kg weight division.

In 2018 at the ISI PALM championship at CNC television studio, Lao Chantrea beat Chhan Chhai of Thailand with an elbow attack.

[10] On Saturday morning of June 26, 2021, at Bayon TV arena, Lao Chantrea got hit by the heavy hand of Thai Rithy and lost the match in the middle of the 3rd round.

[12] At the 32nd SEA Games, Lao Chantrea received a gold medal by defeating Vietnamese boxer Nguyen Hong Quan in the finals of the men's 75 kg weight division.

[15][16] On February 4, 2024, at The Battle of Kings event at the National Television of Cambodia(TVK), Lao Chantrea beat Sudsakorn Sor Klinmee by points.

[20] Lao Chantrea was in attendance at Manny Pacquiao's state visit to Cambodia and was among the Cambodian boxers to take a selfie with the Filipino great.