For all cities with a population greater than one million, Bilbao is closest to Madrid and farthest from Auckland. The closest foreign city is Paris and the farthest domestic city is Barcelona. See below for the top 5 closest and farthest cities (domestically, internationally and by continent) and to see which cities, if any, Bilbao is the closest and farthest to. Filter to include all cities over 100k, 500k or 1 million in population.