Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Orlando Airport to Guam as you normally would.
Due to multiple factors, expect to potentially pay more when booking in July. For low rates, June can be a great choice for travel to Guam. Flights to Guam from Orlando Airport in June are about $2,035 on average during June, but can be found for as low as $1,511.