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