Qantas-backed Jetstar Asia said it will begin plying the increasingly busy Bangkok route from March 23 after cancelling its Pattaya service due to poor demand.

In a separate statement, Tiger Airways, which is 49 percent owned by Singapore Airlines, announced what it described as a "major" network expansion with flights to Macau from March 25, Ho Chi Minh City from April 1 and Hanoi from April 7.

To promote the launch of the Bangkok service, Jetstar Asia will give away 1,000 tickets for a return trip between the two cities for bookings made on its website between March 3 and 16.

During the promotional period, tickets for a one-way trip to Bangkok will start from 28 Singapore dollars (17 US dollars).

"Bangkok remains one of the top business and tourist destinations in the region and is an incredibly popular destination with Singa-poreans," Jetstar Asia's head of marketing Dorit Grueber said in a statement.