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