Nepal has one international airport, Tribhuvan International Airport in Kathmandu. While facilities here are quite basic it is easy to get a visa on arrival and processing times/baggage collection times are quite reasonable by international standards. It is easy to get a prepaid taxi to anywhere in the city with very little fuss and help is always available.
Flights from Europe:
From continental Europe, there are no direct flights. Most airlines that fly to Kathmandu from here transit through India or the Middle East.
Flights from the UK and Ireland
From the UK you can fly via India or via the Middle East depending on the airline.
Flights from Australia & New Zealand
It is easy to fly to Kathmandu from Australia and New Zealand. Transit from here will be through Asia (Kuala Lumpur, Bangkok or Singapore most commonly).
Flights from Canada & the USA
Flights from here involve multiple transits. Generally through Asia or the Middle East depending on the travel route.
Flights and Land Access from India
Getting to Nepal from India is easy. There are land routes here where busses service daily. There are also direct flights from Delhi and also (though not as often) from other Indian cities.
Flights from Asia
There are convenient direct flights to Kathmandu from many Asian airports.
Flights from the Middle East
There are convenient direct flights to Kathmandu from many airports in this region.
It is easy to find your way around Nepal. In Kathmandu, there are taxi’s and rickshaws readily available to take you wherever you wish to go. There are daily tourist buses to all of the major destinations that can easily be booked from your hotel. There are domestic flights which service all of the main tourist areas and while the cost of a flight ticket is higher than that of the equivalent bus the flight times are very fast and the cost is reasonable.
Most people that work in the tourism field speak very good English, so it is easy to communicate and to be understood. Many people also speak other languages as well which is a bonus for tourists.