I've tried looking this up for you but to no avail. From what I can remember, the plane ride from Samoa to American Samoa is about a 45min journey. Sorry, that's all I can add.
A very, very long way.
5,663.96 kilometres (3,519.43 miles)
9,025.25 kilometres (5,608.05 miles)
5,314.21 kilometres (3,302.11 miles)