Bochum is situated about 50 km from Düsseldorf Airport (DUS), about 100 km from Cologne Airport (CGN), and about 300 km from Frankfurt Airport (FRA). Frankfurt Airport has direct flights with 103 airlines to (and from) 308 destinations, more than any other airport in the world. All three airports have excellent train connections to Bochum.
Düsseldorf Airport to Bochum Hauptbahnhof (main station): For detailed schedules, ask bahn.de for travel from "Flughafen Terminal A/B, Düsseldorf" to "Bochum Hbf", and click on "Show details". There will be a five-minute Skytrain from "Flughafen Terminal A/B" to "Flughafen Bahnhof", and then a half-hour train from "Düsseldorf Flughafen" to "Bochum Hbf".
A "Zone D" ticket for about 15 Euros will cover the entire journey as long as you make sure to take an "RE" train or a somewhat slower "S-Bahn" to Bochum. There are also more expensive "Intercity" trains, but the RE trains run frequently, so we recommend "Zone D" tickets. If the ticket does not indicate a time then you must insert the ticket into a stamping machine before boarding.
Frankfurt Airport to Bochum Hauptbahnhof (main station): For detailed schedules, ask bahn.de for travel from "FRA Frankfurt Airport" to "Bochum Hbf" (or "Ruhr-Universität, Bochum" if you want to continue to the university).
You can buy a ticket online or in the train station. The airport has two train stations; do not go to the "Regional" train station to catch a train departing from "Frankfurt(M) Flughafen Fernbf".
Bochum Hauptbahnhof (main station) to the university: Take the subway U35 (direction Hustadt) and get off at station "Universität". This takes about 10 minutes.
If you have a ticket "Zone D" it is still valid here. Otherwise you must buy a ticket "Zone A" in advance (four-ride tickets are slightly discounted) and insert the ticket into a stamping machine before taking the escalator down to the platform. (The subway also has stamping machines on board, which you can use on the way back from the university.)
There are plenty of hotels near the train station.
Version: This is version 2019.10.07 of the "Travel" web page.