Where can i get the cheap flights to Nepal?

I am planning to leave on May 15 and returning August 1. From Dallas, Texas.Where can i get the cheap flights to Nepal?
It is better to use Nepal Airline which is cheap or comfortable ,this year we celebrate our Tourism Year so you enjoy the benefits from the airline
STA travel sometimes has good deals, especially if you are a student, teacher, or younger than 26. Also check kayak for cheap flights.Where can i get the cheap flights to Nepal?
Many websites, especially business sites can help you,good luck!