The drive is 179 km against 139 km as the crow flies, which is the ordinary shape of a German motorway journey. That is 2h 01 in a car that waits for you rather than the other way round, at a fare quoted in full at booking.
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 Mainz: a home, a hotel, an office, a venue. Drop-off is the exact address in Cologne, not the nearest station to it. The route crosses from Rheinland-Pfalz into Nordrhein-Westfalen; the price covers the whole of it including tolls.
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? Cologne Bonn Airport Transfers covers every destination we serve from the airport.