Noi Bai International Airport (IATA: HAN, ICAO: VVNB) (Vietnamese: Sân bay Quốc tế Nội Bài), the biggest airport in northern Vietnam, serves the capital city Hanoi. The airport is 28 miles (45 km) from the city’s downtown. Travel time by taxi takes between 30 to 45 minutes.
Before you even schedule your trip, you will need to get a travel document, that is, passport. Then, you will need a visa to visit some coutries in Asia including Vietnam .You can follow this instructions which provide you useful information and guidelines to easily get a visa to Vietnam: