There will be three flights a week, up from the current two, The Straits Times reported. There are now 35 flights between the two cities per week.
The announcement comes with a 50% off sale on eco-class tickets for all Vietjet routes, including those to Hanoi and Da Nang (currently served by one daily flight each).
Last year Vietjet added 10 aircraft to its fleet, bringing the total to 115. It operated on 170 routes, including new destinations in Australia, India, China, Japan and Southeast Asia.