Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Qatar to Jeju City as you normally would.
Related info for your journey
Useful info, stats and facts about Qatar to Jeju City flights.
For a flight from Qatar to Jeju City, you will be flying into Jeju. Jeju City (CJU) is just 2.7 km from the centre of the city.
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 Jeju City Airport flight would often be abbreviated as a DOH to CJU flight.