Several airlines resumed flights to Bali on Thursday, after cancelling trips to and from the Indonesian resort island due to huge eruptions at a nearby volcano.

Eighty-three international routes were cancelled on Wednesday, the general manager of Bali's international airport said in a statement, after Mount Lewotobi Laki-Laki spewed a nine-kilometre tower of ash into the sky.

The volcano has erupted more than a dozen times over the last two weeks, killing at least nine people and forcing the evacuation of thousands.

Qantas and Jetstar resumed their services to Bali, Australia's Qantas Group said in a statement on Thursday, noting "improved" conditions.

"We will continue to monitor the changing conditions and volcanic activity," it said in the statement.

As of Thursday morning, Bali's airport had recorded another 32 international flight cancellations while 180 international flights were scheduled, the airport's general manager Ahmad Syaugi Shahab said.

He added that volcanic ash from Mount Lewotobi Laki-Laki had been heading away from the airport since Wednesday evening.

"We hope affected airline passengers can resume their travel on Thursday," Ahmad said.

Lewotobi erupted again overnight into Thursday morning, and a thick ash column and lava flows could be seen pouring from its crater, according to authorities. (AFP)