Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Bangkok to Skopje as you normally would.
Related info for your journey
Useful info, stats and facts about Bangkok to Skopje flights.
Located just 14.8 km from the city centre, Skopje is the airport most travellers will use when flying to Skopje from Bangkok. Booking flights from Bangkok to Skopje (SKP) should be relatively easy as there are 0 daily inbound flights from Bangkok from 0 different airlines.
This is defined as Bangkok Suvarnabhumi Airport (BKK) and Skopje Airport (SKP). Codes like Skopje Airport are often used to just call airports uniquely. Bangkok Don Mueang Intl Airport (DMK), Rayong Utapao Rayong Pattaya Airport (UTP), Hua Hin Airport (HHQ) are some additional IATA codes for airports related to your trip.