Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from New Jersey to Charlottetown as you normally would.
Due to multiple factors, expect to potentially pay more when booking in April. For low rates, August can be a great choice for travel to Charlottetown. Flights to Charlottetown from New Jersey in August are about $539 on average during August, but can be found for as low as $322.