Best way to travel between Cardiff, United Kingdom and Dublin, Ireland

A: Cardiff, United Kingdom

B: Dublin, Ireland

Travel Modes: Price; Distance; Duration; CO2

drive: $111.0; 479.75 km; 7h 56mins; 61.41 kgs

bus: $163.0; 484.8 km; 12h 29mins; 14.54 kgs

flight: $168.0; 540.8 km; 4h 39mins; 58.41 kgs

train: $226.0; 513.06 km; 9h 47mins; 27.19 kgs

Tranport	Distance	Time(hrs)	Cost(local)	Cost(usd)
Drive	479.75 km	7h 56mins	82 EUR	111.0
Bus	484.8 km	12h 29mins	120 EUR	163.0
Flight	540.8 km	4h 39mins	124 EUR	168.0
Train	513.06 km	9h 47mins	166 EUR	226.0

Take Car from Cardiff to Holyhead: Time: 4h 29mins Cost: 52 EUR; $ 63.0 - 77.0 USD CO2 Emission: 47.37 kgs
Take Ferry from Holyhead to Dublin: Time: 3h 27mins Cost: 29 EUR; $ 36.0 - 44.0 USD CO2 Emission: 14.04 kgs

Source: Rome2rio

Mode of travel comparision chart

The best and cheapest way to get from Cardiff, United Kingdom and Dublin, Ireland is to travel by car/taxi, which will cost about 82 EUR or 99.90 USD.