direct flight from nadi to apia?

hi there!

does anybody know airlines that are operating nadi - apia? directly, without a stopover in auckland? i've heard of polynesian airlines but i can't find prices on their website... maybe someone has already flewn this route? how much would it be around july?

thanks in advance!!

Air Pacific (FJ) has a direct service between Nadi and Apia, twice per week (Tue, Sun). The former code-share agreement with Polynesian Airlines appears to be not existing anymore.
Fare starts at around FJ$300 one way at present (plus taxes), valid for travel in July.

or is there maybe a connection from nadi (or fiji in general) to apia (samoa) by boat? ferry? sailboat or anything?

There are no scheduled boat services at all between any of the countries in the region. It is simply too far - you need days to get from one country to the other. The only boat services are within a country, like within Fiji, Tonga and Samoa. And one ferry per week between Samoa (Apia) and American Samoa (Pago-Pago ). Even that is a six hour trip already.