Bali's international airport has reopened after a nearly three-day shutdown, airport authorities said, as ash from a rumbling volcano that looms over the island paradise shifted away from the transport hub.

In a statement, the air traffic control provider AirNav said operations at the airport resumed at 2.28pm (6.28am Irish time). 

A spokesman at the airport had said the situation on the ground would be closely monitored.

Bali's airport, the second busiest in Indonesia, is about 60km from the Mount Agung volcano.

Volcanic has ash swept the island since the weekend, stranding thousands of tourists as authorities tried to persuade villagers to leave their homes near the erupting mountain.

Agung towers over eastern Bali to a height of just over 3,000 metres.

Its last eruption in 1963 killed more than 1,000 people and destroyed several villages when it spewed out pyroclastic material, hot ash, lava and mudflow.