Copenhagen airport is the largest airport in Denmark, but there are also two smaller airports in the area, Aarhus (Tirstrup) and Billund (see the map below).
The London flights are from Stansted and are operated by Ryanair. Flights have to be booked directly with Ryanair either online or by phone. The other flights into Aarhus Airport are operated by SAS (from Copenhagen) and British Airways (others) and can be booked through a travel agent.
Copenhagen Airport is the largest airport in Denmark, with hundreds of flights a day from around the world. To reach Aarhus from this airport you need to either take a connecting flight into Aarhus airport or take a train.
The main train station in Aarhus is in the centre of the city. There is a direct service from Copenhagen to Aarhus which takes about 3 hours, with at least one train an hour. Click here for the DSB journey planner to find more about train services within Denmark.
The map below shows the location of the bus stops for Aarhus (Tirstrup) and Billund airports and the main train station.