Air distance from Kathmandu, Nepal to Bangkok, Thailand is 1371.5 Miles (2207.3 Kilometers / 1191.1 Nautical Miles).
2 hrs, 50 mins is the flight duration between Kathmandu and Bangkok. 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.