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