'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'.

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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.