Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Medan to Lebanon as you normally would.
Medan Kuala Namu Intl (KNO) is the airport you will fly out of if you book a flight from Medan to Lebanon. It is only a 23.8 km journey to Kuala Namu Intl (KNO) from Medan’s city centre.
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 Beirut Airport flight would often be abbreviated as a KNO to BEY flight.