Garuda's low-cost subsidiary Citilink plans to launch a Surabaya-Denpasar service.
It plans to launch a twice-daily service from 9 November, said the carrier.
In addition, Citilink plans to increase the frequency of its Jakarta-Medan and Surabaya-Banjarmasin services from three times a day to four times a day.
The airline will also increase its Surabaya-Makassar service from two times a day to three times a day and Jakarta-Surabaya service from six times a day to seven times a day.
Citilink will operate Airbus A320s on the new services, added the carrier.