Noi Bai is located 28 miles north of Hanoi City Center. Travel time between Hanoi Old Quarter and Noi Bai Airport is about 1 hour or 45 minutes without traffic.
Taxis are well regulated as you step out of the airport.The fixed rate from the airport to city center is VND 300,000 (about US$15) and you can request for a drop-off at your hotel. The reverse route is 200,000 ($10).