What is the cheapest way to get from Paris Beauvais to Disneyland Paris for 2 adults?
The link to the Beauvais Airport website posted by naive_child21 gives details of all the possibilities including journey time and prices. The cheapest way is to get the airport bus to Porte Maillot, and then the metro line 1 to Charles de Gaulle Etoile, then RER A to Marne la Vallée/Chessy (next to Disneyland). This costs €13 for the airport bus to Porte Maillot, then €6.45 for the metro/RER ticket to Disneyland. Note that there is a bit of a walk at Porte Maillot to get from where the bus stops to the Metro entrance, but this is all explained on the Beauvais Airport website. Journey time will be between 2.5-3 hours depending on when your flight arrives at Beauvais.