Guadeloupe traveling to & from ?

Hi I’m going Trinidad carnival March 2019

After carnival wanted to see Guadeloupe firstly but as many of Carribean island close an around island ?

Skyscanner not coming up with any flights.

Wondering is it easy ?

Can you book flights on island for cheaper then online sites ?

What would be the best route after leaving carnival ?

Are there any boat ferry at all to Guadeloupe or out of Guadeloupe and to where thanks ?