Khunying Supatra was born at Siriraj, Bangkok-noi district in the province of Thonburi . She was The youngest daughter of Praya Rachamontri Sga Singholaka and Khunying Boonpan.

  At the age of 12 She entered the inner palace walls to serve His Majesty the King RamaVI Until the changes in Monarchy, at which time she had requested to return home.

She received her education Rajanee School and withhim the palace walls. With her ambition and determination, Khunying Supatra graduated with a master degree in law from the Thamasat University in 1939.

On 9 March 1942 she mariied Khun sard Mejudhon ( passed away on 10 August 1971 ) who carried out his civil servant career untill reaching the position of Director of the Department of commerce.She has two daugsters: Supapan and Patravadi.

Khunying Supatra took over ferry crossing business from her mother and introduced the first motoboats. She was the founder of Supatra company Ltd.,Chao Phya Express Boats Co Ltd. and Supratra Elementary and Secondary School.

  As President of the woment Lawyer's Association of Thailand , Khunying Supatra offered her support in having the woment's rights portions of the Civil Code amended. Her numerous public contributions to the weliare and livelihood of the Thai people has earned her National and International recognition and praises.

Today Khunying Supatra is remembered as a woman of great humanity , who by personnal example. To continue her vision of prospering Chao Phraya river anenchanted city of Bangkok and showcase the glory of Thai culture.,chaophraya expressboat Khunying Supatra Khun Supapan Pichaironarongsongkram and Khun Patravadiare proud to extend in addition to the existing business , travel and entertainment .