The aggregate rating of Norwegian Sky is build on scorse given by the following portals:
| Aug / 24 | Sep / 24 | Oct / 24 | ||
| cruisetimetables.com | 3.0 / 86 | 3.1 / 65 | 3.2 / 86 | |
| seascanner.com | 7.8 / 14 | 7.9 / 15 | 7.9 / 15 | |
| cruisemapper.com | 4.0 / 1 | 4.0 / 1 | 4.0 / 1 | |
| cruiseline.com | 3.7 / 3357 | 3.7 / 3367 | 3.7 / 3370 | |
| cruisedirect.com | 4.0 / 123 | 3.97 / 123 | 3.97 / 123 |
Norwegian Sky is also ranked in:
PointNemo.com