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