The public offering is to be made on September 16 and 17 at Bangkok Bank and Krung Thai Bank branches nationwide.
"I expect we will raise about 15 billion baht (484 million dollars)," company president Piyasvasti Amranand said.
Thai Airways was to remain a majority state-owned company with the Finance Ministry holding 51.03-per-cent equity in the national airline.
The extra capital would "increase financial strength and flexibility, improve competitiveness of our fleet by executing comprehensive re-fleeting and aircraft retrofit programme," Piyasvasti said.
"We aspire to be one of the top three airlines in Asia and top five in the world," he added.//DPA
