In our area in NE Ohio, we charge between $14-$17 per acre. In some areas it could be as low as $12/acre and as high as $19/acre. This covers the cost of application only - the farmer is providing the chemical. If the fields are large and wide open, a drone pilot might charge less per acre, but if they are broken up and hard to get to, he may charge more per acre or even have a trip charge in addition to the acreage.