Hi, i am going to Nepal via qatar airlines with transit in dallas for only 1.5 hrs. Is it enough? I am assuming i need to pick my luggaes, go to international terminal while entering another security clearance. Thought, experience? Haven't purchased the tickets yet but options are fairly limited.

1.5 hrs should be good enough, assuming your domestic flight won't get delayed. luggage should be checked all the way to KTM at ur origin. It should auto transfer from domestic to international flights. if you are buying split tickets (two separate, one for Qatar and another for domestic), then there could be issue if your domestic gets delayed and you miss your connecting Qatar flight.

If you buy the ticket together, you do not have to claim luggage until you reach your final destination. 1.5 hr is more than enough provided your flight is on time.