Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Medan to Mongolia as you normally would.
Related info for your journey
Useful info, stats and facts about Medan to Mongolia flights.
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 Mongolia.
This is defined as Medan Kuala Namu Intl Airport (KNO) and Ulaanbaatar Chinggis Khaan Airport (UBN). Codes like Ulaanbaatar Chinggis Khaan Airport are often used to just call airports uniquely. Ulaanbaatar Buyant Ukhaa Airport (ULN), Ulaangom Airport (ULO), Khovd Airport (HVD), Moron Airport (MXV), Dalanzadgad Airport (DLZ) are some additional IATA codes for airports related to your trip.