There is indeed no any accurate info about the time in advance for purchasing tickets from ktm - pkr, it depends on the time frame
if you are flying in Busy seasons like March April or Sep -Nov in Nepali sky i would like you to recommend to buy at least a week ago . if not one or two day before will work .
but cannot advice you to buy in gap of few hours ,
There are several flights available everyday to Pokhara so just purchasing tickets one or two days before are fine. Many airlines operate their flights to Pokhara everday.
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