You can get visa on arrival at the airport and it is an easy process. Depending on your time of arrival, there may be long queues at the immigration desks. You can get ahead of this by preparing your application prior to arrival. Please review the visa fees and make sure to bring enough cash to avoid any potential issues. Click here for more information on Visa on Arrival.
If you wish to apply for visa prior to arriving in Kathmandu, click here.