'Symphony of the Seas' is the fourth in the company's Oasis-class series and its 25th ship in general. As of 9 June 2017, she is the largest passenger ship ever to be constructed by gross tonnage, at 228,021 GRT, surpassing her sister 'Harmony of the Seas'.

The ship measures 1,188 feet (362 m) in length and she will be able to accommodate 5,518 passengers at double occupancy up to a maximum capacity of 6,680 passengers, as well as a 2,200-person crew.

Back in October 2015, the keel was laid and from 15-18 February 2018, she had been conducting sea trials.