The upgrade includes a new passenger terminal and a runway extension.
Transport Minister Arkhom Termpittayapaisith made the announcement. The project is expected to be completed in |2019.
“The Cabinet approved the project in 2014,” Arkhom said.
“The aim is to facilitate cross-border trade and the opening of the AEC.”
He said the expansion required the purchase of 306 rai (49 hectares) of land to build an extended runway.
Some of the land has already been bought, he said.
The ministry will expand the runway from 45x1,500 metres to 45x2,100m.
The taxiway will be expanded from 30x1,300m to 45x1,500m.
The ministry will also build a parking lot, bus parking and an airport entrance road, as well as a 12,000-square-metre passenger terminal that can cater to 600 passengers per hour or 1.5 million per year.
Mae Sot Airport served 87,454 passengers in 2013, 96,330 in 2014 and 144,598 in 2015.
The current terminal is operating at capacity.