The commercial service will start on January 22.
It will be deployed on routes between Bengaluru, Chennai, Delhi, Hyderabad and Mumbai.
It has 28 private Business suites, 24 premium economy seats and 264 seats in economy section.
All seats are equipped with the latest-generation Panasonic eX3 in-flight entertainment system.
High-definition screens are available for all classes.
The first of the Airbus A350 arrived at IGI Airport on December 23.
It will be initially deployed on domestic routes for crew familiarisation.
A350 aircraft are fitted with Rolls Royce Trent XWB engines.
The next set of five aircraft are expected to arrive in March.
The new uniforms, designed by Manish Malhotra, were unveiled recently.