Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Philippines to Réunion as you normally would.
These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Manila Ninoy Aquino Intl Airport to Saint-Denis Gillot Airport flight would often be abbreviated as a MNL to RUN flight. Ready for more IATA code knowledge? These are related airports for your current travel destination: Cebu City Mactan Intl Airport (CEB), Angeles City Clark Intl Airport (CRK), Kalibo Airport (KLO), Davao City Francisco Bangoy Airport (DVO), Panglao Bohol–Panglao Intl Airport (TAG).