Gushing ash from Bali's Mount Agung volcano has dissipated into a wispy plume of steam, and Australian airlines that cancelled some flights to the Indonesian resort island at the weekend have returned to near-normal schedules.

Indonesia's disaster mitigation agency said on Monday the volcano remains at its highest alert level but most of Bali is safe for tourists.

The exclusion zone around the volcano still extends six miles from the crater in some directions. More than 55,000 people are living in shelters.

Airlines Jetstar and Virgin Australia, which cancelled flights over the weekend even as the ash cloud shrank dramatically, said they were resuming services on Monday.

The region's volcanic ash monitoring centre in Darwin, Australia, has stopped issuing advisories for Agung, reflecting that it's currently posing no threat to aircraft. It would resume advisories if there's another eruption.

Tens of thousands of tourists were stranded when ash closed Bali's international airport for nearly three days last week.

Bali's Mount Agung volcano eruption: in pictures Show all 22 1 /22 Bali's Mount Agung volcano eruption: in pictures Bali's Mount Agung volcano eruption: in pictures A fisherman drives a traditional boat as Mount Agung erupts AFP/Getty Bali's Mount Agung volcano eruption: in pictures Police evacuate a villager from inside the exclusion zone REUTERS Bali's Mount Agung volcano eruption: in pictures Villagers watch a river overflowing with water mixed with volcanic ash REUTERS Bali's Mount Agung volcano eruption: in pictures A flight information board shows cancelled flights at Ngurah Rai International Airport in Denpasar, Bali AP Bali's Mount Agung volcano eruption: in pictures A villager takes his cows to a field with Mount Agung volcano erupting in the background AP Bali's Mount Agung volcano eruption: in pictures Police officers wear masks as they patrol in a village in Karangasem AP Bali's Mount Agung volcano eruption: in pictures Clouds of ashes rise from the Mount Agung volcano AP Bali's Mount Agung volcano eruption: in pictures Passengers talk to airline workers as their flights are cancelled AP Bali's Mount Agung volcano eruption: in pictures Mount Agung AP Bali's Mount Agung volcano eruption: in pictures A boy takes pictures during Mount Agung's eruption AFP/Getty Images Bali's Mount Agung volcano eruption: in pictures Mount Agung volcano is seen spewing smoke and ash in Bali EMILIO KUZMA-FLOYD/via REUTERS Bali's Mount Agung volcano eruption: in pictures Balinese Hindus take part in a ceremony, where they pray near Mount Agung in hope of preventing a volcanic eruption AFP/Getty Images Bali's Mount Agung volcano eruption: in pictures Mount Agung volcano erupts for a second time in less than a week REUTERS Bali's Mount Agung volcano eruption: in pictures Balinese Hindus take part in a ceremony AFP/Getty Images Bali's Mount Agung volcano eruption: in pictures Mount Agung volcano is seen erupting from Glumpang village REUTERS Bali's Mount Agung volcano eruption: in pictures A Balinese farmer works as Mount Agung volcano spews volcanic ash EPA Bali's Mount Agung volcano eruption: in pictures Mount Agung during an eruption seen from Kubu sub-district in Karangasem Regency AFP Bali's Mount Agung volcano eruption: in pictures A villager walks near a rice field following the eruption of Mount Agung AP Bali's Mount Agung volcano eruption: in pictures Mount Agung volcano spews volcanic ash Rex Features Bali's Mount Agung volcano eruption: in pictures An officer with the disaster management agency BPBD places a mask on child at a shelter for residents sheltering from Mount Agung volcano Antara Foto/Nyoman Budhiana/ via REUTERS Bali's Mount Agung volcano eruption: in pictures Mount Agung volcano erupts REUTERS Bali's Mount Agung volcano eruption: in pictures Mount Agung's eruption is seen between Balinese temple at Kubu AFP/Getty Images

Indonesian government volcanologists say Agung's crater is about one-third filled by lava and there is still a high risk of more eruptions.

The volcano's last major eruptions in 1963 killed more than 1,100 people and it was active for more than a year.

David Boutelier, a geologist at the University of Newcastle in Australia, said the chance of a violent explosion is still "very high" but possibly not as high as several weeks ago because pressure is being released.