The office of Department of Immigration at Tribhuvan International Airport, Kathmandu facilitates for tourists flying to Nepal by providing Visa on Arrival. For basic information on tourist visa requirements and the processes please find the details in the webpage below:
https://ntb.gov.np/en/plan-your-trip/before-you-come/tourist-visa
Visit the webpage below for the details of the documents and visa fee requirements:
https://nepaliport.immigration.gov.np/