It takes about 3-4 hours by road to reach Halong Bay from Hanoi, depending on the traffic on the route selected. This journey covers a distance of 160-180 kilometers, or 99-112 miles; however, a variable may arise with regard to traveling time, depending upon the status of the roads as well as the time of the day.
Hanoi lies about a 170-kilometer distance from Halong Bay (approximately 106 miles). The journey usually takes around 3.5 hours to 4 hours with a vehicle or a shuttle bus, contingent upon the traffic condition. Delays may sometimes occur in the World Heritage Region; it's preferable to factor in probable traffic during the planning stage.