The aggregate rating of Iona is build on scorse given by the following portals:
| Aug / 24 | Sep / 24 | Oct / 24 | ||
| cruisetimetables.com | 3.0 / 65 | 3.7 / 68 | 3.7 / 71 | |
| seascanner.com | / | 9.0 / 8 | 9.0 / 8 | |
| cruisemapper.com | 4.0 / 1 | 4.0 / 1 | 4.0 / 1 | |
| cruisecritic.com | 3.1 / 310 | 3.1 / 316 | 3.1 / |
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