Jetstar and Qantas were still operating seven flights out of Bali during the day, but said flying conditions at Denpasar Airport were forecast to deteriorate at night because of the erupting Mount Agung volcano.

Seven flights were cancelled on Saturday including the JQ36 to Melbourne.

Jetstar spokeswoman Kate Millar said about 2000 Australians were still in Bali.

"Jetstar and Qantas have brought more than 7000 people back from Bali over the last three days," she said.

The airlines' senior pilots will make further assessments on Saturday night and Sunday morning based on the latest information from the Darwin Volcanic Ash Advisory Centre.

The centre's data shows that a wind change could bring the ash cloud back towards the airport, which is about 60 kilometres away.

There were no flights from Australia to Bali on Saturday due to the unpredictability of volcanic activity.

???Passengers in Bali are being automatically re-booked on relief flights in order of who has been waiting longest.

The closure of Denpasar Airport from Monday to part of Wednesday has stranded thousands of travellers from Australia and other countries.

Jetstar is encouraging people booked to fly to Bali before December 15 to consider changing their travel date or destination, or to cancel their travel and receive a credit voucher.

Passengers are advised to check the status of their flight before heading to the airport.