Best way to travel between Bangkok Thailand and Koh Samui

A: Bangkok Thailand

B: Koh Samui

Travel Modes: Price; Distance; Duration; CO2

train: $28.0; 809.58 km; 15h 24mins; 42.91 kgs

bus: $60.0; 785.4 km; 15h 23mins; 23.56 kgs

drive: $106.0; 754.8 km; 12h 2mins; 96.61 kgs

flight: $168.0; 522.17 km; 4h 1mins; 56.39 kgs

Tranport	Distance	Time(hrs)	Cost(local)	Cost(usd)
Train	809.58 km	15h 24mins	899 THB	28.0
Bus	785.4 km	15h 23mins	1,926 THB	60.0
Drive	754.8 km	12h 2mins	3,402 THB	106.0
Flight	522.17 km	4h 1mins	5,392 THB	168.0

Take Train from Bangkok Hualamphong to Nakhon Pathom: Time: 1h 25mins Cost: 225 THB; $ 6.3 - 7.7 USD CO2 Emission: 3.44 kgs
Take Bus from Nakhon Pathom Bus Station to Don Sak: Time: 10h 34mins Cost: 546 THB; $ 15.3 - 18.7 USD CO2 Emission: 21.4 kgs
Take Ferry from Don Sak to Koh Samui: Time: 1h 33mins Cost: 128 THB; $ 3.6 - 4.4 USD CO2 Emission: 4.13 kgs

Source: Rome2rio

Mode of travel comparision chart

The best and cheapest way to get from Bangkok Thailand and Koh Samui is to travel by train, which will cost about 899 THB or 25.20 USD.