Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Qatar to Paraguay as you normally would.
Related info for your journey
Useful info, stats and facts about Qatar to Paraguay flights.
These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Doha Hamad Intl Airport to Asuncion Silvio Pettirossi Airport flight would often be abbreviated as a DOH to ASU flight. Ciudad del Este Guarani Intl Airport (AGT) are other airports near this flight route and their unique identifiers/IATA codes.