Kathamndu to Pokhara roughly around 2700 on gorkha and 2900 on Buddha, oneway, 15 KG allowence, anymnore than that 500 RS under the table, I have travelled with almost 100 KG recently between three of us. But sad thing is that non nepali (foreign) citizen pay in dollars which is alomst 85 USD, oneway, what a rip off, I can go to Amsterdam and back on that money from London. No wonder not a single tourist use domestic flight in nepal except for Lukla. For Pokhara and Chitwan I advise you to use Greenline Coach, they are very comfortable, overhead A/C, lunch included for 800RS, it is really nice comfortable and nice view to and from Ktm..