Location

By train:
Bacharach has a train station on the route Mainz - Koblenz.

By car:
Take the A61 motorway exit Rheinböllen, then to Bacharach or by the B9 Koblenz - Bingen. Access via  Bacharach - Steeg , the car park is located above the castle.

The closest international airport is Frankfurt am Main.
http://www.frankfurt-airport.com/en/flights---more/flights.html

From "Frankfurt(M)Flughafen“ (airport - follow the signs for "Regionalbahnhof") you can travel by train to Bacharach - there is a direct connection or with one interchange. The OC will shuttle you from the train station.
http://www.bahn.de/p_en/view/index.shtml