The cruise line has stopped offering any tours to active volcanoes after its passengers were caught up in a deadly eruption on Whakaari (White Island) on 9 December.
New Zealand police have named 15 people who have died in the incident and two people who are still missing, but Royal Caribbean has not confirmed if any of them were its guests.
The victims include Australians, Americans and New Zealanders.
Four of them were aged under 18, including 15-year-old Ella Hosking, 13-year-old Matthew Hollander, 16-year-old Berend Hollander and 17-year-old Winona Langford, who is still missing.