If you are considering flying to Bosnia and Herzegovina, you properly will have to fly to Sarajevo which is the main international airport in Bosnia. From a limited number of European destinations you also have direct flights during the summer season, to some of the other international airports in Bosnia.
You can check timetable from the Bosnian airports here:
Sarajevo International Airport:
Mostar International Airport
Banja Luka International Airport
Tuzla International Airport