By bus
Abildskou (http://2.abildskou.dk/go....) operates buses from Copenhagen Valby Station, Copenhagen Airport, Hamburg Airport and Berlin.
Eurolines (http://www.eurolines-trav...) operates buses to Hamburg, from where you can continue to any other european city.
By train
Trains run 1-2 times an hour from Copenhagen København to Aarhus and takes about three hours. Adult fare is DKK 358, an addition DKK 30 to reserve a seat. Discounts are available for persons 25 years old or younger if buying a WildCard at the expense of 180 DKK or older than 65 years. Also, discounts can be obtained by buying Orange Tickets some weeks in advance. Details on DSB's homepage (http://www.dsb.dk/).
It is also possible to catch a train to any other part of the Jutland peninsula, though connections are usually bad. Trains from Hamburg arrive several times a day, but they are expensive around 50 ⬠one way. Nevertheless, if you book about two months before travelling, you can buy one of the few tickets for 29/39⬠called "Europa-Sparpreis". For more information check out the website of the german national railway company DB: (http://www.db.de)
Tickets used in trains are also usable in buses, and if you are travelling from Copenhagen, you can use your ticket for the rest of the day to get around Aarhus at no extra expense.
By plane
Aarhus Airport, Tirstrup (http://www.aar.dk/default...) is approx. 45 minutes bus-ride away. Airport buses (http://www.aar.dk/default...) arrive and leave from Banegårdspladsen in front of the railway station, a one-way ticket costs 100 DKK. Tickets are sold on the bus. Accepted currencies are; Norwegian Crowns, US Dollars, Pounds and Euro. Major Credit Cards are also accepted.
Aarhus airport is serviced by a number of major European airlines; flights from London are serviced also by the low-cost flight provider Ryanair, which has been known to provide fares as low as 1p perone-waytrip.
Billund Airport (http://www.billund-airpor...), with many flight connections, is approx. 90 minutes bus-ride away. Airport buses arrive and leave from Radisson SAS Hotel, a one-way ticket costs 180 DKK. Tickets are sold on the bus. Accepted currencies are; Danish Crowns and Euro. Credit Cards are accepted.