I flew into Nepal via Delhi. It wasn't that bad to tell you the truth. You have to get your baggage out since flight to KTM is from their domestic terminal and the bus ride from intl to domestic is about 15-20 minutes, they circle you around the airport perimeter. Your carrier and the airport both provides this for free but choose the ones from your carrier since those are usually nicer ones. once in the domestic terminal, its very smooth. Enjoy the chicken tikka safeway sandwich while you are there... it was yummy. All in all, I was always very suspicious of indian attitude towards Nepali but I had a good experience on all my 6 flights in/out delhi so far. I think going forward, i will prefer delhi route since i do not have to spend a night in BKK that way and flight was a bit cheaper too. good luck..