A car does Kassel to Frankfurt in roughly 1h 46 over 172 km. The drive is 172 km against 145 km as the crow flies, which is the ordinary shape of a German motorway journey. The difference from every other way of making the trip is that it starts at your address and ends at theirs.
The fare is fixed when you book, so a closed lane or a slow stretch costs you time and not money — there is no meter and no waiting charge. Pickup is any address in Kassel: a home, a hotel, an office, a venue. Drop-off is the exact address in Frankfurt, not the nearest station to it. Both cities are in Hessen, which usually means a single motorway and no rebooking of anything if the day moves.
One vehicle the whole way, one price, and a departure time you choose rather than one a timetable chooses for you. Journeys this length are mostly booked the same day or the day before, and the car can be at the door within the hour in normal conditions. Arriving by air instead? Frankfurt Airport Transfers covers every destination we serve from the airport.