Deputy government spokesman Maj Gen Sansern Kaewkamnerd said the civil servants should act as model for the people in preventing corruption.
The premier said that the officials should reduce their overseas trips as many as possible and that foreign experts could be invited to give lecture in the country instead.
"The premier gave an example that a director general should fly in economy class when travelling in the country. However for the long flights, they should be allowed to travel in better level," the spokesman quoted Prayut as saying.