Due to multiple factors, expect to potentially pay more when booking in July. For low rates, January can be a great choice for travel to Barbados. Flights to Barbados from Isle of Wight in January are about £755 on average during January, but can be found for as low as £507.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Isle of Wight to Barbados as you normally would.