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