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