Being a landlocked country, Nepal cannot be accessed by sea. So, land transport and flight are the possible options for gaining access into Nepal. The beautiful Himalayan nation of Nepal is wedged in between two giant countries India and China. 
By Air
Tribhuvan International Airport in Kathmandu is the only international airport in Nepal. So, all of the international tourists who are visiting Nepal must come to Kathmandu, the capital city of Nepal. Most of the countries have maintained direct flight with Nepal. Some of the major airlines with direct flight in Nepal include China Southwest Airlines, Qatar Airways, Gulf Air and Indian Airlines. Nepal Airlines Corporation (NAC) is the national carrier of Nepal which operates frequent flight in between London and other European countries. Currently, direct flight to Nepal is possible from countries like  Bangkok, Dubai, Doha, Delhi, Karachi, Hong Kong, Abu Dhabi, Osaka, Paro, Singapore, Dhaka and other destinations.
By Air from Asian Countries
Among Asian countries, Nepal can be accessed via flights from Bangkok, Hongkong, India and Singapore. From India, Nepal can be accessed via Airports in Delhi, Calcutta, Banglore and Mumbai. From Tibet, you can catch flight in between Lhasa and Kathmandu. Druk Air will allow you an entrance to Nepal from Paro/ Bhutan.
By Air from European and Middle East Countries
 If you are looking for a daily flight in between Doha and Dubai, you can choose Qatar Airways and Gulf Air. If you are in European countries, you can choose Bangladesh Biman, Pakistan International and other airways companies. Check for the schedule before booking flight to Nepal.
By Air from Australia and New Zealand
There is no direct flight in between Australia and New Zealand and Kathmandu. Transit destination will be at Singapore or Hongkong or Bangkok.
By Land
Altogether, eight entry points have been opened for access in Nepal. Two entry points are from Tibet side and six entry points are from India side. Entry points from India are in Kakarbhitta,Belahiya, Nepalgunj, Birgunj, Mahendra Nagar and Dhangadi while entry point from Tibet is atKodari.
This beautiful Himalayan nation allows easy and hassle free access to Nepal to its guests.