Air distance from Kathmandu, Nepal to Topeka, USA is 7845 Miles (12625.3 Kilometers / 6812.6 Nautical Miles).
Flight duration time from Kathmandu to Topeka is 16 hrs, 17 mins. This is the In-The-Air flight time. You should also add the taxi time, airport wait times and possible delays due to bad weather, etc. for the total flight duration time.