Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Richmond, Virginia to Gdansk 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 Richmond Byrd Intl Airport to Gdansk Rebiechowo Airport flight would often be abbreviated as a RIC to GDN flight.