Best way to travel between Bangkok Thailand and Singapore

A: Bangkok Thailand

B: Singapore

Travel Modes: Price; Distance; Duration; CO2

train: $51.0; 1938.19 km; 37h 24mins; 102.72 kgs

bus: $63.0; 1930.95 km; 26h 51mins; 57.93 kgs

flight: $84.0; 1543.36 km; 5h 44mins; 166.68 kgs

drive: $290.0; 1921.5 km; 23h 52mins; 245.95 kgs

Tranport	Distance	Time(hrs)	Cost(local)	Cost(usd)
Train	1938.19 km	37h 24mins	64 SGD	51.0
Bus	1930.95 km	26h 51mins	79 SGD	63.0
Flight	1543.36 km	5h 44mins	105 SGD	84.0
Drive	1921.5 km	23h 52mins	363 SGD	290.0

Take Train from Bangkok Hualamphong to Butterworth: Time: 21h 23mins Cost: 38 SGD; $ 27.0 - 33.0 USD CO2 Emission: 62.13 kgs
Take Train from Butterworth station to Singapore Woodlands: Time: 14h 8mins Cost: 21 SGD; $ 15.3 - 18.7 USD CO2 Emission: 39.23 kgs
Take Train from Marsiling to City Hall: Time: 51mins Cost: 3 SGD; $ 1.8 - 2.2 USD CO2 Emission: 1.37 kgs

Source: Rome2rio

Mode of travel comparision chart

The best and cheapest way to get from Bangkok Thailand and Singapore is to travel by train, which will cost about 64 SGD or 45.90 USD.