A senior director in the Civil Aviation Authority of Thailand said [on June 20] that international flights were not likely to resume in Thailand until late September.

CAAT director-general, Chula Sukmanop, was [reported saying] none of the airlines he met had expressed interest in resuming international flights by next month when the order shutting down the country's airspace is due to expire.
....

Although flights have resumed (domestic only), the AoT think getting back to normal volume however will take longer. Looking at the long-range forecast for recovery AoT announced flights wouldn't return to 'normal' before October 2021.

State of emergency extended until end of July
National
Jun 29. 2020
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By THE NATION
The state of emergency was extended for another month, until July 31, at Monday (June 29)’s meeting of the government’s Centre for Covid-19 Situation Administration (CCSA).

The meeting, which was headed by Prime Minister Prayut Chan-o-cha, considered the fifth phase of lockdown easing, the state of emergency, and the reopening of Thailand’s border to foreigners.

The CCSA reportedly extended the state of emergency to aid the fifth-phase easing and the reopening of schools and colleges on July 1.

Businesses set to be reopened on July 1 include pubs, bars and entertainment venues.

BANGKOK (Reuters) - Thailand on Monday reported seven new coronavirus cases, all of which were imported, marking 35 days without community transmission.

The seven cases were Thais returning from India and the United States who had tested positive while in state quarantine, said Sukhum Kanchanapimai, the health ministry's permanent secretary.

The coronavirus has killed 58 people in Thailand, among 3,169 infections, of which 3,053 patients have recovered.

Thai nationals
Persons with exemption or persons being considered, permitted or invited by the Prime Minister, or the head of responsible persons accountable for resolving state of emergency issues to enter the Kingdom, as necessary. Such consideration, permission or invitation may be subject to specified conditions and time limits.
Non-Thai nationals who are a spouse, parents, or children of a Thai national.
Non-Thai nationals who hold a valid certificate of residence, or permission to take up residence in the Kingdom
Non-Thai nationals who hold a valid work permit or are allowed to work in the Kingdom, including their spouse or children.
Carriers of necessary goods, subject to immediate return after completion.
Crew members who are required to travel into the Kingdom on a mission, and have a specified date and time for return.
Non-Thai nationals who are students of educational institutions approved by Thai authorities, including the parents or guardians of the students.
Non-Thai nationals who are in need of medical treatment in Thailand, and their attendants. However, this shall not include medical treatment for COVID–19.
Individuals in diplomatic missions, consular affairs, international organizations, government representatives, foreign government agencies working in Thailand, or individual in other international agencies as permitted by the Ministry of Foreign Affairs, including their spouse, parents, or children.
Non-Thai nationals who are permitted to enter the Kingdom under a special arrangement with a foreign country..