The closest major airport to Heidelberg is Frankfurt Airport (Flughafen Frankfurt am Main), which is about 80 km north of the city. Frankfurt Airport is an international hub with flights from numerous airlines across the globe. After arriving at Frankfurt Airport, you can reach Heidelberg through various modes of transportation:
Heidelberg Hauptbahnhof is well-connected to other major cities in Germany and neighboring countries via the Deutsche Bahn (German railways) network. Regular trains, including ICE, IC (InterCity), and regional trains, can be taken to Heidelberg from cities like Stuttgart, Munich, Cologne, and Berlin.
If you're planning to drive to Heidelberg, you can reach the city via the A5 and A6 autobahns. It's a scenic route that offers some beautiful views of the German countryside. Ensure you adhere to autobahn driving regulations, including speed limits where indicated.
Several long-distance bus companies, such as Flixbus, offer service to Heidelberg from various cities in Germany and European countries. The buses are comfortable and an affordable option, but the journey may take longer than a train.
Once in Heidelberg, you can make use of the efficient public transport system, which includes trams, buses, and the funicular railway to reach the castle. Tickets can be bought at the station, and day passes are available for convenience.