ok thanks for all your replies and putting me straight on the puerto plata to santo domingo journey.
Ive found the AeroCaribbean website now so can book the Santo Domingo - Santiago de Cuba flight directly on their website.
I will take the bus then. I was abit worried about taking a bus as i will be travelling on my own and I dont speak Spanish.
So basically the buses run about every hour and costs about US$5
Where do I get the bus in Puerto Plata?
Does it take me straight to the airport?
Who do I book the bus with/is there a website?
Thank you.