The Noi Bai Airport of Hanoi is the nearest airport to Ninh Binh.
You can hire a private car or taxi from Hanoi to Ninh Binh for VND 1546014.00- 1932517.50. The driver will take you via the Highway 1 which is a scenic route. The Ho Chi Minh Highway has a route as well and is especially popular among bikers.
Trains from Hanoi to Ninh Binh are available.