Chadchart as an academic had the opportunity to help and give advice to the Ministry of Transport during the
Thaksin Shinawatra and
Samak Sundaravej governments without holding any position until 2012, when Prime Minister
Yingluck Shinawatra invited him to serve as the Deputy Minister of Transport. Chadchart was appointed as the Minister of Transport in October 2012. Chadchart as Minister of Transport is regarded as an elite figure of the government in the country's strategic planning. In 2019, Chadchart announced that he intended to run in the
2022 Bangkok gubernatorial election as an independent candidate. In February 2022, Chadchart officially launched his gubernatorial election campaign, with the slogan "Bangkok, a liveable city for everyone" () with important policies such as creating a network of maps of crime hotspots, and developing a public transport system to make Bangkok a city of arts and learning.
Bhichit Rattakul, former Governor of Bangkok, and
Nikom Wairatpanij, former President of the Senate of Thailand also joined Chadchart for the campaign. Chadchart won the
2022 Bangkok gubernatorial election in a
landslide victory, receiving over 1.3 million votes and becoming the first governor-elect to lead in all 50 districts. == Public image ==