Best way to travel between Hong Kong , Hong Kong and Singapore

A: Hong Kong , Hong Kong

B: Singapore

Travel Modes: Price; Distance; Duration; CO2

flight: $94.0; 2691.52 km; 6h 37mins; 290.68 kgs

flight: $140.0; 2719.32 km; 8h 16mins; 293.69 kgs

flight: $160.0; 2726.41 km; 8h 40mins; 294.45 kgs

drive: $900.0; 4355.52 km; 56h 12mins; 557.51 kgs

Tranport	Distance	Time(hrs)	Cost(local)	Cost(usd)
Flight	2691.52 km	6h 37mins	118 SGD	94.0
Flight	2719.32 km	8h 16mins	175 SGD	140.0
Flight	2726.41 km	8h 40mins	200 SGD	160.0
Drive	4355.52 km	56h 12mins	1,127 SGD	900.0

Take Bus from Cathay City to Hong Kong Airport: Time: 5mins Cost: 0 SGD; $ 0.1 - 0.2 USD CO2 Emission: 0.11 kgs
Take Flight from HKG to SIN: Time: 3h 54mins Cost: 113 SGD; $ 81.0 - 99.0 USD CO2 Emission: 288.31 kgs
Take Train from Changi Airport to Tanah Merah: Time: 8mins Cost: 1 SGD; $ 0.9 - 1.1 USD CO2 Emission: 0.36 kgs
Take Train from Tanah Merah to City Hall: Time: 20mins Cost: 3 SGD; $ 1.8 - 2.2 USD CO2 Emission: 0.65 kgs

Source: Rome2rio

Mode of travel comparision chart

The best and cheapest way to get from Hong Kong , Hong Kong and Singapore is to travel by air, which will cost about 118 SGD or 84.60 USD.