Flying from India to Kathmundu

Hi

We're currently in Sikkim and are looking at getting to Nepal in the next 2 weeks or so - preferably by flying from Bhadrupur in Nepal after crossing the border at Kakarbhita

Does anyone know if we can get tickets directly from Yeti or Buddha airlines as the commisons that the travel agenst are looking for is madness !!

Also - has anyone done the overland route by bus....is it OK ?

Cheers