The contract for construction of the highway was signed on February 20, 2018.
Of the 50-kilometre long highway around the island, being built at a cost of THB701 million, 34 kilometres have already been finished and opened for public use.
The unfinished part was 15.5km long, from Ban Hua Thanon in Na Muang sub-district to Ban Chaweng in Bo Put sub-district.
The construction of Highway 4169 will support more traffic, enhance safety, promote tourism for Surat Thani and southern Thailand, the authority said.
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The project is expected to spread economic prosperity at the local and national levels.
The highway, known previously as Taweeratphakdee Road, circled around communities on the island to the Koh Samui district office.