Best way to travel between Hanoi, Vietnam and Phnom Penh

A: Hanoi, Vietnam

B: Phnom Penh

Travel Modes: Price; Distance; Duration; CO2

bus: $71.0; 1776.59 km; 46h 11mins; 53.3 kgs

train: $86.0; 2102.88 km; 40h 6mins; 111.45 kgs

drive: $150.0; 1467.9 km; 22h 41mins; 187.89 kgs

flight: $203.0; 1161.68 km; 6h 24mins; 125.46 kgs

Tranport	Distance	Time(hrs)	Cost(local)	Cost(usd)
Bus	1776.59 km	46h 11mins	284,190 KHR	71.0
Train	2102.88 km	40h 6mins	344,230 KHR	86.0
Drive	1467.9 km	22h 41mins	600,401 KHR	150.0
Flight	1161.68 km	6h 24mins	812,542 KHR	203.0

Take Bus from Ha Noi to Ho Chi Minh Mien Dong: Time: 38h 1mins Cost: 200,134 KHR; $ 45.0 - 55.0 USD CO2 Emission: 44.23 kgs
Take Car from Ho Chi Minh Mien Dong to Ho Chi Minh: Time: 6mins Cost: 24,016 KHR; $ 5.4 - 6.6 USD CO2 Emission: 0.85 kgs
Take Bus from Ho Chi Minh to Phnom Penh: Time: 7h 4mins Cost: 56,037 KHR; $ 12.6 - 15.4 USD CO2 Emission: 8.89 kgs

Source: Rome2rio

Mode of travel comparision chart

The best and cheapest way to get from Hanoi, Vietnam and Phnom Penh is to travel by bus, which will cost about 284,190 KHR or 63.90 USD.