The distance between Frankfurt am Main and Frankfurt (Hahn) airport is ca. 120 km:
Get a bus outside Hahn airport. There is a bus that goes into Frankfurt city which goes through Frankfurt airport and (eventually!) stops across from Frankfurt central train station. The bus runs...
It's 13.7 km from the city to the airport following the roads, which is about 16 minutes driving.
6,547.31 kilometres (4,068.32 miles)
298.46 kilometres (185.46 miles)