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