Oulu is easily accessible by plane even from afar. Oulu Airport is the second busiest in Finland and dozens of flights from Finland as well as from abroad arrive there on a daily basis. For example Arctic Airlink, Norwegian and Finnair operate at the airport bringing customers safely to Oulu from elsewhere in Finland, neighbouring countries and further away.
For travellers from closer areas, travelling by bus or train is ideal; you can get to Oulu from almost everywhere in Finland in a short period of time. The Oulu region is ideally covered with a rental car, while moving around in Oulu is convenient by bicycle or by local bus.