Bali flights: Qantas sale on airfares from Sydney, Melbourne, Brisbane, Adelaide and Canberra

Qantas has launched a huge sale on flights to Bali from five major cities, with return flights starting from $639.

Australians looking to head to the Indonesian paradise from Sydney, Melbourne, Brisbane, Adelaide and Canberra can score discounted flights during the week-long sale, which runs until next Thursday, December 14.

The sale fares are available for periods between January and June next year, with the cheapest ticket available for $639 for a return economy flight.

Customers willing to spend a little more money can splurge on business class with tickets starting at $2,449.

All Qantas flights include checked baggage, free food and drinks and seat selection.

Meanwhile, the Australian government has issued a stern warning to Australians heading to Bali to be on their best behavior.

Qantas has launched a weekly sale on flights from five major cities to Bali, with prices starting from $639 return

Qantas has launched a weekly sale on flights from five major cities to Bali, with prices starting from $639 return

This week Qantas also launched its Christmas sale and unveiled its two festive-themed aircraft (pictured, Dasher-8)

This week Qantas also launched its Christmas sale and unveiled its two festive-themed aircraft (pictured, Dasher-8)

This year, the Indonesian government cracked down on tourists heading to the small tourist island.

It introduced an official list of what is and is not allowed for tourists, a hotline where anyone can report misbehaving travelers and a special task force to keep an eye on foreigners.

Next year, Indonesia will also introduce a 'tourist tax'.

“The biggest problem regarding foreigners in Bali is the large number of low-spending foreign tourists who often cause problems,” Indonesian Director-General of Immigration Silmy Karim said in August.

'Because Bali belongs to the category of cheap tourist destinations, it attracts tourists with thin pockets.

'We hope that with the formation of the Bali Becik Task Force, the number of law violations by foreigners in Bali will decrease.'

Qantas' Bali sale follows the airline's Christmas sale which kicked off on Tuesday.

More than 40 discounted routes were available for under $150, with economy fares starting at just $109 for a one-way flight.

The Christmas sale ends next Tuesday, December 12.

Qantas also recently unveiled its two new Christmas-themed aircraft, QantasLink's Q400 'Dasher-8' and 737 'Roo-dolph'.

The two aircraft will fly across Australia's domestic and regional network until the end of December.

The sale on Bali flights from Sydney, Melbourne, Brisbane, Adelaide and Canberra continues until next Thursday

The sale on Bali flights from Sydney, Melbourne, Brisbane, Adelaide and Canberra continues until next Thursday

Passengers on board the special flights also receive double frequent flyer points.

December also saw Qantas' 'wine time' change from 4pm to 12pm, for the first time in the company's history.

The change means domestic customers traveling in economy can enjoy a complimentary Australian wine or beer with lunch and afternoon snacks.