Two workers walk under the wing of a 737 Max aircraft at the Boeing factory in Renton, Washington, US, March 27, 2019. (Photo: REUTERS)

The approval is based on operators including Singapore Airlines complying with airworthiness directives and additional flight crew training requirements, the Civil Aviation Authority of Singapore said in a statement.

Singapore grounded the 737 MAX in March 2019 following two fatal crashes. The approval for its return comes months after the model returned to service in the United States and Europe, and follows more recent lifting of grounding orders in other countries, including Australia, Japan, India and Malaysia. 

China is the biggest market in the region that has yet to approve the return of the 737 MAX, though Boeing last month conducted test flights in the country.