You Do Need power plug adapter while traveling from United States Virgin Islands to Azores.

Here is Why You Need An Adapter

The outlet and plug type used in Azores are B, C and F and in United States Virgin Islands are A and B. This is how they look like.

United States Virgin Islands

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

Type A

Type B

Azores

In Azores, outlets of type B, C and F are in use.

Type B

Type C

Type F