To find the return flight distance between Montpellier to Carcassonne via Saint-Guilhem-le-Désert, start with entering the locations in the control and click on Return Flight Distance. You can also add multiple destinations in between while returning from a location. If you are not aware of the routes, you can check the
Montpellier to Carcassonne Route via Saint-Guilhem-le-Désert.