For all cities with a population greater than five hundred thousand, Oulu is closest to Helsinki and farthest from Auckland. The closest foreign city is Saint Petersburg and the farthest domestic city is Helsinki. See below for the top 5 closest and farthest cities (domestically, internationally and by continent) and to see which cities, if any, Oulu is the closest and farthest to. Filter to include all cities over 100k, 500k or 1 million in population.