Theerathon Bunmathan

Buriram United

Theerathon started almost every match for Buriram United during that period.Theerathon contributed to several successful seasons for Buriram United. He contributed goals and assists from set pieces. His free kick against FC Seoul in the 2013 AFC Champions League qualified Buriram to the knockout phase as groups runners-up drawing with Urawa Reds Diamonds at 10 points.. In the 2013 Thai Premier League Theerathon scored 3 goals against BEC Tero Sasana, Chonburi, and Ratchaburi Mitr Phol.

Muangthong United

In May 2016, it was announced that after spending seven years with Buriram United, he would be joining arch rivals Muangthong United the following month on a five-year contract for an all-time record for the highest football transfer fee for Thai League 1 at 35 million Baht. That record was soon broken on 2 November 2016 by Tanaboon Kesarat. The transfer fee is undisclosed but it is estimated to be around 50 million Baht.

Vissel Kobe

In February 2018, Theerathon was on loan to play in the J.League 1 club, Vissel Kobe for the remainder of the 2018 season, where he played alongside players including Lucas Podolski, David Villa, and Andres Iniesta.

Yokohama F. Marinos

In January 2019, Yokohama F. Marinos reached an agreement on loan to Theerathon from Muangthong United to play for the 2019 season. Hereafter, in March 2019, he started his first league match for the club in the match in which Yokohama opened the home match…

A versatile defender, Theerathon regularly plays as a left-back, and sometimes he has been deployed as a centre-back, central midfielder, and left midfielder. Primarily a left-back, Theerathon Bunmathan has also been deployed in central defence and midfield roles, contributing to both defensive and attacking phases of play through his passing and involvement in set pieces. Theerathon regularly takes set pieces, including free kicks and corners. Theerathon has been noted for his talents being visible since a young age, and he has been singled out for his mentality, consistency, and leadership.

Theerathon played against Saudi Arabia in the 2014 FIFA World Cup qualification and received a red card in the 90th minute. After that match he went to Indonesia to play for Thailand U-23 in the 2011 Southeast Asian Games. He was Thailand U-23's starter and received an early yellow card, followed by a second one a few minutes after which resulted in a red card, thus becoming the first player in Thai football to get two red cards in three days. Theerathon's scored a penalty in a friendly match against Laos. His second international goal is a rebound from Jakkraphan Pornsai's free kick. He was a regular starter during the 2012 AFF Suzuki Cup forming an effective partnership on the left flank with Anucha Kitpongsri. He represented Thailand U-23 at the 2013 Southeast Asian Games, and is selected as captain for the tournament. In May 2015, he captained Thailand to play in the 2018 FIFA World Cup qualification against Vietnam. In December 2018, Bunmathan was called up for the 2019 AFC Asian Cup in the United Arab Emirates. In January 2024, he was named in the 26-man squad for the 2023 AFC Asian Cup in Qatar. He earned his 100th cap with the national team against Oman in the second group stage match of the Asian tournament.

On 24 May 2016, Theerathon married Chatrakamol Muangman in a traditional ceremony. The wedding was attended by many teammates and staff from the teams for which Theerathon had played.