Estimated travel durations
The straight-line distance from Hong Kong to Hanoi is 871 kilometers (541 miles). This is the crow-flies distance calculated using the Haversine formula.
A direct flight from Hong Kong to Hanoi takes approximately 2h. This is an estimate based on an average cruising speed of 800 km/h and does not include boarding, taxiing or layover time.
Driving from Hong Kong to Hanoi would take approximately 9h at an average speed of 85 km/h. The actual driving time may vary depending on road conditions, traffic and border crossings.
The distance from Hong Kong to Hanoi is 541 miles (871 km) as the crow flies.