Seating 174 passengers, the aircraft is powered by IAE V2527-A5 engines.
The Bangkok-based carrier started regional operations on July 7 with daily flights to Macau, before flying domestically to Krabi, Chiang Mai, Surat Thani and Phuket.
The aircraft is the first of 11 A320s which will be delivered to THAI Smile by mid-2015. The first six aircraft being used by the airline have been leased from SMBC Aviation Capital.