Hanoi city bus number 07 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. Buses run from 5 a.m. to 10 p.m.
Airport taxi costs a fixed 160, 000 VND (10 USD) for a sedan, 190, 000 (12 USD) for an SUV, and toll charges are included in the price. A taxi to city center takes about 30 minutes.
There is also the Airport Minibus, which is 22, 000 VND for Vietnamese or 32, 000 VND (2.0 USD) for foreigners but only leaves after it is completely filled.
Minibuses and taxis park right in from of the airport exit gate. There are 3 companies operating several kinds of taxi/minibus and they are almost the same in price and service.