As their closest rivals failed to win, the league leaders took full advantage as they recorded a 16th win of the campaign thanks to Chitipat Tanklang and David Rochela.
It took only three minutes for Tanklang to open the scoring for the hosts and Rochela added a second four minutes before the hour to secure the points, while Predrag Sikimic was dismissed for the visitors who fell to a fourth successive defeat.
Title rivals Muang Thong United lost ground on Buriram, but may have been satisfied with taking a point after coming from behind to draw 2-2 at Chiangrai United.
With Dragan Talajic's side facing a third defeat in four matches, they rescued a point with five minutes to play as Mario Gjurovski found the net.
Chonburi were grateful to Thiago Cunha as they grabbed a 1-1 draw with Suphanburi, also hitting back from a goal down to rescue a point and remain in second place.
BEC Tero Sasana were also unable to keep the heat on Buriram or move into an AFC Champions League spot as Osotspa extended their unbeaten run to six games with a goalless draw at the 72-years Anniversary Stadium
In a good weekend for the struggling sides there was also a much needed win for Songkhla United as they beat Chainat Hornbill 1-0, but Police United missed the chance to climb out of the bottom five as they were held to a 2-2 draw by TOT.
Meanwhile, Ratchaburi were the highest-placed side to win, moving up to seventh with a comprehensive 3-0 triumph over Bangkok United, and Bangkok Glass beat Sisaket 2-1.
