You Do Need power plug adapter while traveling from Saint Kitts and Nevis to United States Virgin Islands.

Here is Why You Need An Adapter

The outlet and plug type used in United States Virgin Islands are A and B and in Saint Kitts and Nevis are D and G. This is how they look like.

Saint Kitts and Nevis

In Saint Kitts and Nevis, outlets of type D and G are in use.

Type D

Type G

United States Virgin Islands

In United States Virgin Islands, outlets of type A and B are in use.

Type A

Type B