Kruewan Wongrakmit, managing director of Nakhonchai Air Co, said she hoped to launch new services on routes between Bangkok and Siem Reap and Bangkok and Phnom Penh, and another from Phnom Penh to Ho Chi Minh City, early next year.
The company hoped to conclude talks with Cambodia by September, and had prepared 10 buses to operate on the three routes.
Cambodia will be Nakhonchai Air's first service outside Thailand. It is also looking at bus services in Laos and Myanmar.
Nakhochai Air has plans to list on the Thai stock exchange. It operates interprovincial, air-conditioned bus services between Bangkok and northern, northeastern and eastern regions.