For all cities with a population greater than one million, Singapore is closest to Kuala Lumpur and farthest from Quito. The closest foreign city is Kuala Lumpur. 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.