Liege can be reached easily by plane and by train.
Both of them are served by low-cost companies (Ryanair, Easyjet), with direct flights to and from all major European cities.
From these airports, it takes one hour by train to reach Liege. The easiest way to reach Liège by train is to arrive at the Liège-Guillemins station, that is well connected to many Belgian, Dutch, German, French and British cities. The Belgian rail company (SNCB/NMBS) provides both national and international travel information (timetables, route planner, fees, ticket booking, etc.).
There are also direct connections to Liege with the high-speed trains Thalys from Paris, Cologne and Düsseldorf, as well as with the ICE trains from Cologne and Frankfurt.