Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from North Carolina to Grenada as you normally would.
Due to multiple factors, expect to potentially pay more when booking in November. For low rates, May can be a great choice for travel to Grenada. Flights to Grenada from North Carolina in May are about $738 on average during May, but can be found for as low as $399.