Since Thailand announced the state of emergency on Tuesday, five countries immediately issued the warnings - Australia, Canada, Japan, South Korea and United Kingdom.
Association of Thai Travel Agents (ATTA) president Apichart Sankary said the political unrest should end before September 15, which is the start of the high season of tourism industry.
Prakit Shinamourphong, president of Thai Hotels Association (THA), said business operators are worrying over political turmoil. "It is too soon to finalise the degree of impact on the hotel and tourism business, but operators are not happy with the situation," said Prakit.
A number of tourists have checked out from hotels in Thailand for fears that state enterprises' labour union strikes could disrupt their travelling plans. Importantly, the Hat Yai International Airport has remained shut down while some train services to the South are halted.