Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Medan to Greenland as you normally would.
Medan Kuala Namu Intl (KNO), located 23.8 km from the city centre, is the airport you fly out of when you book flights from Medan to Greenland.
These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Medan Kuala Namu Intl Airport to Nuuk Airport flight would often be abbreviated as a KNO to GOH flight. Kangerlussuaq Airport (SFJ), Ilulissat Airport (JAV), Sisimiut Airport (JHS), Narsarsuaq Airport (UAK), Kulusuk Airport (KUS) are some additional IATA codes for airports related to your trip.