However it warned that the movement of ash cloud is highly unpredictable and flights could still be cancelled at short notice.
The Mount Agung volcano on Bali erupted with greater force Sunday, prompting some airlines to cancel flights to and from the popular resort island and forcing an worldwide airport on a nearby resort island to close, according to local officials.
"Tourism in Bali is still safe, except in the danger (zone) around Mount Agung", Indonesia's Disaster Mitigation Agency said in a statement yesterday. Suantika said Agung could spew ash for at least a month but did not expect a major eruption.
The island's main airport is for now operating normally, but some airlines have cancelled flights.
Staff at Indonesia's volcano monitoring centre said it was not just pulverised rock being blown out of Mt Agung, but magma has now reached the volcano's surface.
"Once the airports find volcanic ash trace, we'll close down the airport for flights", said Herson, chief of Bali's Ngurah Rai airport.
Authorities have told people within a 7.5km exclusion zone to "immediately evacuate" in an "orderly and calm manner".
Several thousand people were affected by Saturday's flight cancellations.
About 25,000 people are thought to still be in temporary shelters after more than 140,000 people fled earlier this year.
The mountain's last major eruption occurred in 1963, killing more than 1,000 people.
Most recently, the 3,142-metre volcano spewed grey smoke and ash as high as 700 metres Tuesday, and again Saturday to twice that height, before beginning to emit lava Sunday.
Indonesia has more active volcanoes than any other country, including some of the world's most famous, such as: Krakatau (Krakatoa), Tambora, and Merapi.
Indonesia sits on the Pacific "Ring of Fire" where tectonic plates collide, causing frequent seismic and volcanic activity.