The Noibai airport is around 45 km (28 miles) and takes 35-40 minutes by taxi to the city center. Hanoi city buses number 7 and 17 connect Noi Bai Airport with Hanoi city center.The bus stop is just on the right side of the terminal exit. Traveling by bus costs 5,000 VND (0.3 USD) per person and takes about one hour. however, we do not recommend as it is very crowded, moreover, you also need to transfer from bus station to your hotel.