The Bangkok-Chiang Mai service will be increased to twice daily at the end of next month.
Early next year, when it receives two more A320 Airbuses, Thai Smile plans a daily flight between Phuket and Singapore, competing head-on with Thai AirAsia, Jetstar and Tiger Airways.
The new “lite” airline has already replaced its parent with two daily flights from Bangkok to Surat Thani and four to Krabi.
In April next year it will replace Thai on services between Bangkok to Ubon Ratchathani (twice a day) and Udon Thani (three times a day).
Apart from its domestic routes, Thai Smile currently has one regional service, from Bangkok to Macau.
It is not clear at the moment what other longer-haul services will be launched.
The new airline’s managing director, Woranate Laprabang, said that a service between Phuket and Mumbai in India was considered, but the management believes there is not enough traffic year round to justify the route.
Also dropped was a plan to fly between Bangkok and Hyderabad, because of lack of cargo space on the A320.
Thai Smile currently has three 174-seat A320-200 aircraft, with eight more on order.