Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Butuan to Denver as you normally would.
Related info for your journey
Useful info, stats and facts about Butuan to Denver flights.
These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Butuan Airport to Denver Intl Airport flight would often be abbreviated as a BXU to DEN flight.