get all online comparisons through www.kayak.com I have used this website for comparison all the time before I bought tiks to anywhere.

If you are leaving from NYC area, the best bet ( if you are thinking INEXPENSIVE) is to go through Delhi. If you have a Nepali PP, Delhi sometimes can be a hassle, but not as much. Take Jet Airways (try flexible dates) NYC/EWR-BRU-DEL-KTM for less than $1200 if you are a little flexible with yor dates.

The flight through middle east are goddarn expensive and aren't that fast in terms of total travel time anyways!