Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Medan to Bhutan as you normally would.
Related info for your journey
Useful info, stats and facts about Medan to Bhutan flights.
For a flight from Medan to Bhutan, you will be flying from Kuala Namu Intl. Medan Kuala Namu Intl (KNO) is just 23.8 km from the centre of the city.
This is defined as Medan Kuala Namu Intl Airport (KNO) and Paro Airport (PBH). Codes like Paro Airport are often used to just call airports uniquely. Jakar Bathpalathang Airport (BUT) are other airports near this flight route and their unique identifiers/IATA codes.