I think the best rate right now is from Gulf Airlines. Due to the price hike on oil, there is no way you can get tickets on $1500. I paid $1788 for tickets to Nepal for this summer.

The route is like this:

Dallas ----- Frankfurt ---- Bahrain ------ Kathmandu

And its a round trip. The best thing on my route is that I have only 4 hours transit except in Bahrain and thats about 6 hours only. Well, I think its not that bad if you compare to the transit thats almost 12 hours long.