Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Dumaguete City to Guam as you normally would.
Related info for your journey
Useful info, stats and facts about Dumaguete City to Guam flights.
For a flight from Dumaguete City to Guam, you will be flying from Dumaguete. Dumaguete City (DGT) is just 3.0 km from the center of the city.
Dumaguete City Airport is DGT and Tamuning Guam Intl Airport is GUM. These codes are created by the International Air Transport Association (IATA) and airlines use them to identify the departing and arrival airports in the flight routes they service.